KABUL, Afghanistan (AP) – A man in an Afghan army uniform opened fire on a group of Americans at a base in the south of the country, killing a U.S. soldier and wounding another, an Afghan military spokesman said Monday.

Spokesman Gen. Mohammad Zahir Azimi said the gunman was also killed in the shootout on Sunday. “Right now, an investigation is going on to determine whether he really was a soldier or someone using an army uniform. And if he was a soldier, what caused the shooting,” Azimi said.

Similar attacks have raised fears of increased Taliban infiltration of the Afghan police and army as NATO speeds up the training of the security forces. In some cases the attackers were Afghan soldiers who turned on NATO troops. Others involved insurgents dressed in Afghan uniforms.

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