By Ross Colvin
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Baghdad - The number of U.S. soldiers to die in Iraq has reached 4,000, the U.S. military said on Monday, just days after the fifth anniversary of a war that President George W. Bush says the United States is on track to win.
The U.S. military said in a statement four soldiers were killed late on Sunday when a roadside bomb, the biggest killer of American soldiers in Iraq, exploded near their vehicle in southern Baghdad. One soldier was wounded in the attack.
The deaths came on a day when the U.S.-protected "Green Zone", the government and diplomatic compound in central Baghdad, was hit by repeated rocket and mortar fire, part of an upsurge in violence in the capital and elsewhere.