One American , One American died in attack near airfield . U.S. Defense Secretary Leon Panetta left Washington hours before blast . `` As ( President Obama ) has already made clear , any U.S. presence would only be at the invitation of the Afghan government and aimed at training Afghan Forces and targeting the remnants of al-Qaeda . '' `` Brave Taliban fighter '' detonated the bomb , the group says . Karzai , Obama invited Karzai to visit Washington early next year .
One American , One American died in attack near airfield . U.S. Defense Secretary Leon Panetta left Washington hours before blast . `` Brave Taliban fighter '' detonated the bomb , the group says . Karzai , Obama invited Karzai to visit Washington early next year .