目击者称，北约武装直升机在空中射击。
Eyewitnesses say Nato helicopter gunships were firing from the air.
一架警方直升机嗡嗡地掠过里约的上空，机舱两边各有一名身着黑衣的狙击手，做好了射击准备。
A police helicopter rattles through the skies over Rio, black-clad snipers poised at either side.
美国国防部官员否认有关报导，这些报导说，巴基斯坦军人星期天晚上向两架据称在攻击一个激进分子基地过程中侵犯了巴基斯坦领空的美国直升机射击。
Pentagon officials deny news reports that Pakistani soldiers fired at two U.S. helicopters late Sunday for allegedly violating Pakistan's airspace in a suspected attack on a militant base.
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