The United States has a "special responsibility" to help Iraq address a dire humanitarian crisis that sees huge numbers of displaced Iraqis struggle to survive, an aid group said Wednesday.

In a report released on the eve of the seventh anniversary of the US-led invasion of Iraq, Refugees International said 33 percent -- or 500,000 people -- of the 1.5 million internally displaced people forced from their homes in 2006 and 2007 "live as squatters in slum areas."

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