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Photo by: Shah Khaild

Pakistani border guards stand on alert at a terminal of Afghanistan-bound NATO trucks parked at the Pakistani border post of Chaman along the Afghanistan border on Wednesday, Oct. 6, 2010. Pakistan blocked a vital supply route in the country's north for U.S. and NATO troops in Afghanistan in apparent retaliation for an alleged cross-border helicopter strike by the coalition that killed three Pakistani frontier troops. (AP Photo/Shah Khalid)

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