4 Policemen Killed in Afghanistan Four Afghan police officers were shot and killed Friday in Helmand Province in an insider attack by their colleagues, officials said. The police chief of the Grish district, Mohammad Toryali, said the shooting occurred at a police outpost during a shift change. The officers on duty were killed by four of their colleagues who had arrived to replace them, Mr. Toryali said. The killers fled. On Thursday, an American service member was killed in an insurgent attack in southern Afghanistan, a military statement said.