Three Americans Killed By Afghan Policeman

Sunday, July 22, 2012 | 2:07 p.m.

Three American civilians were shot and killed on Sunday by an Afghan policeman who opened fire on a training center.

An Afghan authority told CNN that they were likely working at the West Zone Police Training Center in western Afghanistan. All three were in Afghanistan working for the International Security Assitance Force, according to NATO spokesman Maj. Adam Wojack.

CNN is reporting conflicting accounts of the circumstances of the shooting and there is no information about the gunman's possible affiliation with and insurgent groups in the country.