The report accuses the international community, especially the United States, of ignoring "one of the largest humanitarian crises of our time."

"We believe the United States has a special responsibility to Iraqi refugees, if only to restore its credibility. The violence they flee is an unplanned-for byproduct of the American invasion of Iraq, and its chaotic aftermath," the report said.

The U.N. High Commissioner for Refugees has said the Iraqi refugee crisis is the most significant population displacement in the Middle East since Israel was established in 1948.