More than 600,000 Iraqis have died by violence since the U.S.-led invasion in 2003, according to a study released Wednesday by researchers at Johns Hopkins University. The figure vastly exceeds estimates cited by the US and Iraqi government, the United Nations, aid and anti-war groups. Commenting on these controversial figures, James D. Fearon, CDDRL Affiliated Faculty Member, said "One thing (the study may) certainly do is confirm the view that there is a very, very serious civil war going in Iraq."