http://www.financialpost.com/todays-paper/Taliban+Trap+downed+Helicopter+official/5225491/story.html

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Puli Alam, Afghanistan The Taliban enticed U.S. forces into an elaborate trap to shoot down their helicopter Friday, killing 30 U.S. troops in the deadliest such incident of the war, a senior Afghan government official said Monday. The man, who spoke on condition of anonymity, said Taliban commander Qari Tahir lured U.S. forces by tipping them off that a Taliban meeting was taking place. "The Taliban knew which route the helicopter would take. That's the only route, so they took position on the either side of the valley on mountains and as the helicopter approached, they attacked it with rockets and other modern weapons," he said. He added President Hamid Karzai's government "thinks" the attack was retaliation for the killing of Osama bin Laden.