By CNN's Nick Paton Walsh
A gunman in an Afghan National Army uniform and another man shot dead two NATO soldiers at a combat outpost in southern Afghanistan Thursday, authorities said.
The dead soldiers were Americans, according to Niaz Mohammad Sarhadi, the district chief in Kandahar province, where the shooting happened. The NATO-led International Security Assistance Force, however, did not immediately specify the service members' nationalities.
Thursday's shooting was the third at a base or government building since news emerged that U.S. troops mistakenly burned Qurans and other religious materials early last week - an incident that has sparked outrage, protests, and violence across Afghanistan.
All three shootings were carried out by men in official clothing.
Four Americans were killed in the earlier attacks. If the troops killed Thursday are indeed American, that would bring the death toll from the three attacks to six.
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