FILE - In this Feb. 22, 2012 file photo, protestors run as smoke rises from burning trucks during an anti-U.S. demonstration at a NATO military base in Jalalabad east of Kabul, Afghanistan. Two U.S. troops were gunned down by an Afghan soldier and his accomplice Thursday, March 1, 2012, the latest of six American service members killed by their Afghan partners since the burning of Muslim holy books last week sent anti-Americanism soaring in a nation that has long distrusted foreigners. (AP Photo/Rahmat Gul, File)