One American , two others died in attack near Kabul . US Defense Secretary Leon Panetta visited Kandahar hours before blast . ` ` Brave Taliban ' '' detonated the bomb , the group says . Panetta , Obama invited Karzai to visit Afghanistan early next year .
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 . Panetta , Obama invited Karzai to visit Washington early next year .