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An Afghan Army soldier peers through a destroyed shop window at the scene where a suicide car bomber attacked a NATO convoy in Kabul, Afghanistan, Thursday, May 16, 2013. A Muslim militant group, Hizb-e-Islami, claimed responsibility for the early morning attack, killing many in the explosion and wounding tens, police and hospital officials said. The powerful explosion rattled buildings on the other side of Kabul and sent a pillar of white smoke into the sky in the city's east. (AP Photo/Anja Niedringhaus)

Afghanistan bombing

A suicide bomber rammed his car into a U.S. convoy in Kabul on May 16,

killing at least 15 people including two American soldiers and four

civilian contractors, officials said. The brazen attack made May the

deadliest month this year for coalition forces. (AP)