An employee got into an argument with a supervisor early Wednesday, then shot and killed four people at a western Kentucky plastics plant before killing himself, police said. The shooting happened at Atlantis Plastics in Henderson, an Ohio River town of about 28,000 people. Police Lt. David Piller said two others were injured and flown to hospitals in Evansville, Indiana. At least one was in critical condition, officials said. The shooting victims were scattered around the plant, Piller said, and the employee had apparently retrieved the handgun used in the shootings during a break. "It appears the shooting was random at this time," Piller said.