TUXTLA GUTIERREZ, Mexico (AP) -- Mexican authorities returned about 400 migrants to their native Guatemala Wednesday, a day after they and 113 other migrants were found hidden inside two trailer trucks. Officials of Mexico's National Immigration Institute said the 113 migrants still being held are from nations that don't share borders with Mexico or are Guatemalan minors or women who require special treatment. The 400 Guatemalan migrants were returned to their country in air-conditioned buses Wednesday, a stark contrast to the sweltering, overcrowded trailers where they were found. The remaining migrants include 47 from El Salvador, 32 from Ecuador, 12...