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Migrant families cross the Rio Grande to get illegally across the border into the United States, to turn themselves in to authorities and ask for asylum, next to the Paso del Norte international bridge, near El Paso, Texas. The Border Patrol said it has encountered more than 180 groups of over 100 people since October, compared with 13 in the previous 12-month period and two the year before. (AP Photo/Christian Torrez)