March 12 (Reuters) - A U.S. marine was killed in combat on Sunday in the western province of Anbar, the U.S. military said. Another U.S. soldier was killed and two wounded by a roadside bomb that hit their patrol during a mission supporting an air assault southwest of Baghdad also on Sunday. A third U.S. soldier was killed by an explosion during fighting in Salah ad Din province, and a fourth died on Sunday in an incident which was not related to combat and is under investigation, the military said. Following are the latest figures for military deaths in Iraq since the U.S.-led invasion in March 2003: U.S.-LED COALITION FORCES: United States 3,194 Britain 134 Other nations 124 IRAQIS: Military Between 4,900 and 6,375# Civilians Between 58,476 and 64,273* # = Think-tank estimates for military under Saddam Hussein killed during the 2003 war. No reliable official figures have been issued since new security forces were set up in late 2003. * = From www.iraqbodycount.net (IBC), run by academics and peace activists, based on reports from at least two media sources. IBC says on its Web site that the figure underestimates the true number of casualties.
