A USA Today study has found that the U.S. dropped or fired nearly 11,000 cluster bombs or cluster weapons on Iraq during the invasion and Britain dropped 2,000 more. It is unknown how many Iraqis died from cluster bombs. One estimate puts the total at 370. And the attacks left behind thousands of unexploded bomblets. At least eight U.S. soldiers and an unknown number of Iraqis have been killed by unexploded bomblets.