Worker kills 4, self

(CNN) - A worker at a plastics plant in Henderson, Kentucky allegedly
shot and killed four co-workers after an argument with a supervisor early
Wednesday, according to local police.Police said the shooter then used his gun to kill himself.

About a half hour after the worker "had words with a supervisor, said Henderson Police Sgt. John Nevels, "Witnesses saw the supervisor and the shooter walk outside together. They heard a gunshot and the shooter come back inside the plant and he shot numerous people."

It is unclear if the supervisor was among the four killed.