DEL RIO — Federal agents said Sunday that they have begun to draw down the population of the thousands of migrants, mostly from Haiti, who were stuck seeking shelter under a bridge in this small border community as authorities sought to process their asylum claims. Agents moved 3,300 of the migrants as of Sunday. That left more than 12,000 people still waiting to be processed, U.S. Border Patrol Chief Raul Ortiz said at a news conference. In the past week, thousands of people from the Caribbean and South America arrived at the Del Rio bridge seeking asylum. Many of them have slept ...