In this July 12, 2014, file photo, a young migrant girl waits for a freight train to depart on her way to the U.S. border, in Ixtepec, Mexico. In a report released Monday, August 21, 2016, the UN children's agency said that thousands of children trying to escape gang violence and poverty in Central America have made their way to the United States this year and there is no sign that the flow is letting up. (Photo by Eduardo Verdugo/AP Photo)
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