KABUL, Afghanistan (AP) -- NATO says a person wearing an Afghan police uniform has shot dead two of its service members inside a compound in northern Afghanistan.

The international military coalition says it's still investigating the shooting Monday in Faryab province. But initial reports say the shooter fired the shots and fled the scene. It did not provide further details.

It was not immediately clear if the shooter was an Afghan police officer. There have been incidents of both Afghan security forces turning on their Western counterparts and of insurgents donning uniforms to infiltrate bases and attack from the inside.

of the troops in the east are American.

The latest death makes a total of 102 NATO service members killed so far this year. In the same period of 2010, 129 NATO troops died.