An Afghan policeman conducting a joint operation with U.S. soldiers opened fire on the Americans, killing two of them before fleeing, an Afghan official said Saturday, raising fears that militants have infiltrated the ranks of Afghan forces.
The U.S. military earlier said two American troops died in a firefight in Wardak on Friday, but declined to confirm any new details.
Although Afghan forces have periodically turned their guns on international troops, training and working jointly with Afghan police and soldiers on patrols and operations are key to the U.S. strategy of curbing the spreading Taliban-led insurgency.
Shahidullah Shahid, a spokesman for the Wardak provincial governor, said the policeman fired on the Americans while they were patrolling together Friday night, killing two and injuring two. Shahid said two of the officer's relatives were in custody for questioning.
A third U.S. service member died Friday of wounds from a bomb attack in Wardak the day before.