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In page Refugee crisis:

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Roughly 40% of Iraq's middle class is believed to have fled, the U.N. said. Most are fleeing systematic persecution and have no desire to return. All kinds of people, from university professors to bakers, have been targeted by militias, insurgents and criminals. An estimated 331 school teachers were slain in the first four months of 2006, according to Human Rights Watch, and at least 2,000 Iraqi doctors have been killed and 250 kidnapped since the 2003 U.S. invasion.[6] Iraqi refugees in Syria and Jordan live in impoverished communities with little international attention to their plight and little legal protection.[citation needed] In Syria alone an estimated 50,000 Iraqi girls and women, many of them widows, are forced into prostitution just to survive.[7][8]