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Two US troops killed in Afghan chopper crash

In this file photograph taken on November 22, 2008 US soldiers board a UH-47 Chinook helicopter landing in Afghanistan's Khost province -- along the Afghan-Pakistan border. Two US troops have been killed after a NATO helicopter crashed in eastern AfghanisA NATO helicopter crashed in eastern Afghanistan on Tuesday killing two US troops, officials said, adding there was no insurgent activity in the area at the time of the incident.