Four US soldiers and their Iraqi interpreter were killed today when their vehicle struck a roadside bomb northwest of Baghdad, the US military said.
The statement issued by the 4th Infantry Division that patrols the Iraqi capital did not give further details.
The United States, which has around 133,000 troops in Iraq, suffers daily casualties in insurgent and other attacks three years after the overthrow of Saddam Hussein.
Roadside bombs are the number one cause of US deaths in Iraq, where more than 2,400 US soldiers have died since the 2003 invasion.
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Guerrillas drawn from the Sunni Arab minority that dominated Iraq under Saddam are fighting against the Shia-led government and its US backers.