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Man 'planned Santa Monica attack'

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SANTA MONICA, CA - JUNE 07:  A bullet hole is seen in a bullet-riddled crashed car in which a woman was reportedly shot, near a burning home with two bodies inside, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have been injured, and a suspect was taken into custody.  (Photo by David McNew/Getty Images)

SANTA MONICA, CA - JUNE 07: A bullet hole is seen in a bullet-riddled crashed car in which a woman was reportedly shot, near a burning home with two bodies inside, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have been injured, and a suspect was taken into custody. (Photo by David McNew/Getty Images)

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SANTA MONICA, CA - JUNE 07:  A police officer and a transit official look at a bullet hole, one of many, in a public transit bus in which two passengers were shot, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings.  (Photo by David McNew/Getty Images)

SANTA MONICA, CA - JUNE 07: A police officer and a transit official look at a bullet hole, one of many, in a public transit bus in which two passengers were shot, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings. (Photo by David McNew/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Firefighters sit near a burned house they extinguished before finding two bodies inside after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings.  (Photo by David McNew/Getty Images)

SANTA MONICA, CA - JUNE 07: Firefighters sit near a burned house they extinguished before finding two bodies inside after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings. (Photo by David McNew/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Santa Monica Police officers prepare to search the campus of Santa Monica College after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Santa Monica Police officers prepare to search the campus of Santa Monica College after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Santa Monica Police officers enter a parking lot after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Santa Monica Police officers enter a parking lot after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Students at Santa Monica College are stopped by a Los Angeles Police officer as they tried to pick up their cars i nside the locked down college after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Students at Santa Monica College are stopped by a Los Angeles Police officer as they tried to pick up their cars i nside the locked down college after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Students at Santa Monica College holding hands are released from the campus after they were locked down following multiple shootings reported on the campus June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Students at Santa Monica College holding hands are released from the campus after they were locked down following multiple shootings reported on the campus June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Santa Monica Police officers enter a parking lot to search after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Santa Monica Police officers enter a parking lot to search after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Santa Monica Police officers enter a parking lot to search after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Santa Monica Police officers enter a parking lot to search after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  A U.S. Marshal deputy directs a Santa Monica Police officer as they search  a parking lot after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: A U.S. Marshal deputy directs a Santa Monica Police officer as they search a parking lot after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. Six people were killed in the rampage, according to news reports. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  A police officer holds police line tape at the scene of a bullet-riddled crashed car in which a woman was reportedly shot, near a burning home with two bodies inside, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have been injured, and a suspect was taken into custody.  (Photo by David McNew/Getty Images)

SANTA MONICA, CA - JUNE 07: A police officer holds police line tape at the scene of a bullet-riddled crashed car in which a woman was reportedly shot, near a burning home with two bodies inside, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have been injured, and a suspect was taken into custody. (Photo by David McNew/Getty Images)

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SANTA MONICA, CA - JUNE 07:  A police officer looks at the scene of a bullet-riddled crashed car in which a woman was reportedly shot, near a burning home with two bodies inside, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have been injured, and a suspect was taken into custody.  (Photo by David McNew/Getty Images)

SANTA MONICA, CA - JUNE 07: A police officer looks at the scene of a bullet-riddled crashed car in which a woman was reportedly shot, near a burning home with two bodies inside, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have been injured, and a suspect was taken into custody. (Photo by David McNew/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles County SWAT team sharp shooter in helicopter circles the Santa Monica College after a multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles County SWAT team sharp shooter in helicopter circles the Santa Monica College after a multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles Police Department Officers block the entrance to Santa Monica College after multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles Police Department Officers block the entrance to Santa Monica College after multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles Police Department Officers deploy around the Santa Monica College near the library after multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles Police Department Officers deploy around the Santa Monica College near the library after multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles County SWAT team members search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles County SWAT team members search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Students look on as Los Angeles Police Department Officers deploy around the Santa Monica College near the library after multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Students look on as Los Angeles Police Department Officers deploy around the Santa Monica College near the library after multiple shootings were reported on June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  An ambulance arrives on scene after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California.  According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: An ambulance arrives on scene after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Fire trucks and police vehicles arrive on scene after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California.  According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Fire trucks and police vehicles arrive on scene after multiple shootings were reported on the campus of Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  California Highway Patrol Officers contain a scene at Santa Monica College after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California.  According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: California Highway Patrol Officers contain a scene at Santa Monica College after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. According to reports, at least one person has died, four people hospitalized, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles County SWAT team members search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California.  According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles County SWAT team members search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles County SWAT team members search the grounds of Santa Monica College near the library after multiple shootings  were reported on the campus June 7, 2013 in Santa Monica, California.  According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles County SWAT team members search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Students rush to safety after shots were fired near the Santa Monica College on June 7, 2013 in Santa Monica, California. According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Students rush to safety after shots were fired near the Santa Monica College on June 7, 2013 in Santa Monica, California. According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles Police Department officers along with Los Angeles County Sheriff deputies search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California.  According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles Police Department officers along with Los Angeles County Sheriff deputies search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Los Angeles Police Department officers along with Los Angeles County Sheriff deputies search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California.  According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Los Angeles Police Department officers along with Los Angeles County Sheriff deputies search the grounds of Santa Monica College near the library after multiple shootings were reported on the campus June 7, 2013 in Santa Monica, California. According to reports, at least three people have been injured, and a suspect was taken into custody. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Realtives of two victims who were killed during the Santa Monica College shootings are overcome with grief near the scene where an SUV crashed throught the wall of a parking lot across the street from the college June 7, 2013 in Santa Monica, California. According to reports, seven people are dead including the shooter and three people were injured.  (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Realtives of two victims who were killed during the Santa Monica College shootings are overcome with grief near the scene where an SUV crashed throught the wall of a parking lot across the street from the college June 7, 2013 in Santa Monica, California. According to reports, seven people are dead including the shooter and three people were injured. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Law enforcement personal invstigate the shooting scene where an SUV crashed throught the wall of a parking lot and hit several cars across the street from the Santa Monica College weher a multiple shootings happened on campus June 7, 2013 in Santa Monica, California. According to reports, seven people are dead including the shooter and three people were injured.  (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Law enforcement personal invstigate the shooting scene where an SUV crashed throught the wall of a parking lot and hit several cars across the street from the Santa Monica College weher a multiple shootings happened on campus June 7, 2013 in Santa Monica, California. According to reports, seven people are dead including the shooter and three people were injured. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Law enforcement personal invstigate the shooting scene where an SUV crashed throught the wall of a parking lot and hit several cars across the street from the Santa Monica College weher a multiple shootings happened on campus June 7, 2013 in Santa Monica, California. According to reports, seven people are dead including the shooter and three people were injured.  (Photo by Kevork Djansezian/Getty Images)

SANTA MONICA, CA - JUNE 07: Law enforcement personal invstigate the shooting scene where an SUV crashed throught the wall of a parking lot and hit several cars across the street from the Santa Monica College weher a multiple shootings happened on campus June 7, 2013 in Santa Monica, California. According to reports, seven people are dead including the shooter and three people were injured. (Photo by Kevork Djansezian/Getty Images)

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SANTA MONICA, CA - JUNE 07:  A bullet-riddled crashed car in which a woman was reportedly shot is seen near a burned home with two bodies inside after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings.  (Photo by David McNew/Getty Images)

SANTA MONICA, CA - JUNE 07: A bullet-riddled crashed car in which a woman was reportedly shot is seen near a burned home with two bodies inside after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings. (Photo by David McNew/Getty Images)

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SANTA MONICA, CA - JUNE 07:  Bullet holes are seen on a public transit bus in which two passengers were shot, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings.  (Photo by David McNew/Getty Images)

SANTA MONICA, CA - JUNE 07: Bullet holes are seen on a public transit bus in which two passengers were shot, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have died in the shootings. (Photo by David McNew/Getty Images)

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Los Angeles Police officers detain a man near a shooting at Santa Monica College (AP/Tami Abdollah)

Los Angeles Police officers detain a man near a shooting at Santa Monica College (AP/Tami Abdollah)

AP

SANTA MONICA, CA - JUNE 07: A bullet hole is seen in a bullet-riddled crashed car in which a woman was reportedly shot, near a burning home with two bodies inside, after multiple shootings were reported at various locations including Santa Monica College June 7, 2013 in Santa Monica, California. According to reports, at least six people have been injured, and a suspect was taken into custody. (Photo by David McNew/Getty Images)

A US police chief has said the gunman who killed four people in a chaotic rampage planned the attack and had 1,300 rounds of ammunition.

Jacqueline Seabrooks said the gunman, who was killed by police in Santa Monica, California, had a rifle, a duffel bag full of ammunition magazines and extra weaponry.

She said the suspect had a run-in with police seven years ago, but she could not comment further because he was a juvenile at the time.

She spoke near a display of weapons and ammunition recovered from Santa Monica College where the killings ended when police fatally shot the gunman.

Ms Seabrooks said police are investigating the gunman's connection to a house where the killings began a mile from campus. She would not identify the killer but said he would have turned 24 on Saturday.