Mexican migration authorities said on Monday they had rounded up 246 migrants from around a major bus terminal in the north of the capital city, including more than 50 children who have been placed under the guardianship of social services. Mexico has seen a surge of people seeking to cross the country en route to the U.S. border, with a record number of migrants apprehended by U.S. authorities over the past year, many fleeing desperate economic conditions or violence in their home countries. In a statement, Mexico's migration agency INM said the latest group of migrants were gathered around the bus terminal's "benches, sidewalks, open spaces and corridors."