This image made from AP video shows Afghan National Army soldiers rushing to the scene moments after a car bomb exploded in front the PRT, Provincial Reconstruction Team, in Qalat, Zabul province, southern Afghanistan, Saturday, April 6, 2013. Six American troops and civilians and an Afghan doctor were killed in attacks on Saturday in southern and eastern Afghanistan as the U.S. military's top officer began a weekend visit to the country, officials said. (AP Photo via AP video)Militants killed six Americans and an Afghan physician in a pair of attacks in Afghanistan on Saturday, the deadliest day for america in the conflict in eight months.

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