A manufacturing plant employee has shot and killed three colleagues and injured five more in the state capital of Missouri, police said.
Police arrived at the plant at about 2228 on Tuesday (0328 GMT) in response to a reported shooting, Jefferson City police said in a statement.
Nearly 20 minutes later, the gunman appeared outside a police station.
He is then thought to have fired one shot at officers before turning his weapon on himself.
He was pronounced dead at the scene, police said.
Are we having a philosophical discussion here, or am I being reprimanded?