A stunned US soldier from 2-12 Infantry Battalion rests on the hood of a Humvee as fellow soldiers tend to a comrade overcome by shock after an Improvised Explosive Device (IED) detonated on his vehicle during a patrol in the predominantly Sunni al-Dora neighborhood of southern Baghdad.March 20 mark the 4th anniversary of the US-led invasion of Iraq in 2003 and more than 3200 U.S. troops were killed since then.(Xinhua/AFP Photo) Photo Gallery>>>

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