Afghan security men inspect the scene of a car bomb explosion in Kabul, Afghanistan, on Monday, Dec. 17, 2012, outside a compound housing a U.S. military contractor. (AP Photo/Musadeq Sadeq)

Photo by: Musadeq Sadeq

Afghan security men inspect the scene of a car bomb explosion in Kabul, Afghanistan, on Monday, Dec. 17, 2012, outside a compound housing a U.S. military contractor. (AP Photo/Musadeq Sadeq)