Source:
Reuters(Reuters) - A NATO helicopter incursion into Pakistan's North Waziristan wounded two troops on Tuesday, local intelligence officials said, further ratcheting up tensions between Islamabad and the West.
"It happened early morning," a Pakistani intelligence official in the region, who declined to be identified, told Reuters. "The helicopter hit a Pakistani check post on the border in the Datta Khel area."
Another intelligence official said several Pakistani helicopters took off from Miranshah, the main town in North Waziristan, toward the site of the attack. The purpose of the Pakistani mobilization was unclear.
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http://www.reuters.com/article/2011/05/17/us-pakistan-nato-idUSTRE74G0PS20110517