One American , two Afghans died in attack near airfield . U.S. Defense Secretary Leon Panetta left Kandahar hours before blast . The Taliban claimed responsibility , the group 's spokesman Qari Yousuf Ahmadi said in an e-mail CNN obtained . `` Brave Taliban fighter '' detonated the bomb , the group says . Score: 6
One American , two Afghans died in attack near airfield . U.S. Defense Secretary Leon Panetta left Kandahar hours before blast . `` Brave Taliban fighter '' detonated the bomb , the group says . Score: 6