In this Aug. 25, 2011 photo, a Pakistani dealer holds fertilizer containing ammonium nitrate in Multan, Pakistan. The U.S. government believes that most of the bombs killing its troops in Afghanistan ... more 
In this Aug. 25, 2011 photo, a Pakistani dealer holds fertilizer containing ammonium nitrate in Multan, Pakistan. The U.S. government believes that most of the bombs killing its troops in Afghanistan are made with a chemical fertilizer produced by a single company in Pakistan and American officials have launched an intense and so far unsuccessful push for regulation. (AP Photo/Khalid Tanveer) less 
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Associated Press | Photo By Khalid Tanveer
Wed, Aug 31, 2011 1:34 PM EDT