Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. NATO: Insurgents Behead 6 Police in Afghanistan VOA News 21 July 2010 NATO forces in Afghanistan say militants have beheaded six Afghan police officers in the northern part of the country. In a statement Wednesday, NATO said the killings occurred Tuesday during an insurgent attack on a school, clinic and local government building in Dahanah-ye Ghori, a district of Baghlan province. NATO says police successfully repelled the assault, but that during the attack, insurgents overran a police checkpoint and killed the officers. The alliance condemned the incident as "brutal" and "barbaric." In a separate development Wednesday, Afghanistan's defense ministry said an argument prompted an Afghan soldier to shoot at and kill two U.S. civilian trainers at an army base Tuesday. The ministry released a statement saying the soldier opened fire on the Americans after getting into a verbal argument with them. Another Afghan soldier was killed in the crossfire, and the gunman was also shot and killed. NATO said the incident occurred during a weapons training exercise at the Camp Shaheen army base near Mazar-e-Sharif, the capital of the northern province of Balkh. The shooter was believed to be an Afghan army trainer assigned to the base. A joint Afghan-NATO investigation has been launched into the incident. The attack comes a week after a similar incident in which three British troops were killed by an Afghan soldier in southern Helmand province. The soldier fled after the attack. Afghan forces have been working closely with their international counterparts as they seek to assume primary responsibility for security in their country. Some information for this report was provided by AP and AFP. .