A man wanted by police in connection with three fatal shootings - including that of his estranged wife in the car park of a high school - has been arrested.
Police in the Maryland suburbs of Washington DC said 62-year-old Eulalio Tordil had been taken into custody without incident.
They identified Tordil as an employee of the Federal Protective Service, which provides security at federal properties. Tordil was put on administrative duties in March after a protective order was issued against him.
Police said he followed 44-year-old Gladys Tordil to their children's Beltsville's High Point High School on Thursday and shot her. He also shot and wounded a man who tried to intervene.
At the Westfield Montgomery Mall in Bethesda, about 10 miles northwest of Washington, one person was initially shot and two others may have been shot coming to that person's aid, said Montgomery County Police Assistant Chief Darryl McSwain.
A man died and another one is in critical condition, said Montgomery County police spokesman Captain Paul Starks said. A woman has injuries that are not life-threatening.
About a half an hour later, police were called to a shooting at a Giant Food store in Aspen Hill, about five miles away. Police later tweeted that a woman died after that shooting.