Afghan security personnel walks at the site of a blast in Kabul

 
Afghan security personnel walks at the site of a blast in Kabul
An Afghan security personnel walks at the site of a blast in Kabul December 17, 2012. Afghanistan's Taliban movement claimed responsibility for a suicide bombing in Kabul on Monday which targeted a U.S. contracting company and killed two Afghan civilians, underscoring security challenges ahead of a NATO pullout. REUTERS/Mohammad Ismail