He says any guards who acted improperly should be held accountable . Blackwater said its guards were protecting a U.S. diplomatic convoy when they came under fire in Nusoor Square in western Baghdad . Guards receive target letters from Justice Department that often precede arrests . Guard says its men were ambushed ; witnesses say guards were not provoked . Witnesses say motorists , children and innocent were among those killed .
He says any guards who acted improperly should be held accountable . Guards receive target letters from Justice Department that often precede arrests . Guard says its men were ambushed ; witnesses say guards were not provoked . Witnesses say motorists , children and innocent were among those killed .