To stanch the flow of illegal migrants to the U.S., the Department of Homeland Security has been preparing a national operation to deport Central American families who have evaded removal orders, according to a government official.

Starting early next month, U.S. Immigration and Customs Enforcement, a DHS unit, plans to start rounding up hundreds of families that entered the U.S. illegally and who have ignored a final order to leave the country, said the official. Such an order is issued by a judge in immigration court.

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