A 25-year-old man has shot and killed five of his co-workers in the US state of Kentucky before killing himself.
Police say that Wesley Higdon, 25, argued with his supervisor about not wearing safety goggles and using his mobile phone while on an assembly line at a plastics plant.
"He's thought to have gotten into an argument with a supervisor earlier, " said police.
It is reported that he then called his girlfriend and told her he was going to kill his boss.
He returned around two hours later with a gun, killing the supervisor and four other employees before turning his gun on himself.
"There's more than two people dead. There's like one, two, three, four, five people dead," a man calling from the plant told emergency services. "The supervisor is dead, too."
Police Sgt. John Nevels said: "He walked in, looked like he meant business and started shooting at everybody."
Henderson County Coroner identified the supervisor as Kevin G Taylor, 30, of Dixon and the slain co-workers as Trisha Mirelez, 25, Rachael Vasquez, 26, and Joshua Hinojosa, 28, all of Sebree; and Israel Monroy, 29, of Henderson.
Another victim, a woman, was in a stable condition in hospital. The 22-year-old is being treated at St Mary's Hospital in Evansville. The rampage happened at about 00:15 local time (4:15am GMT) on Wednesday.