HARLINGEN — Three U.S. citizens — including a prominent Laredo customs broker and a Sweetwater businessman — were kidnapped Sunday along with two others after going deer hunting in northern Mexico, U.S. authorities said Tuesday. A gang of armed men swept into the 6,500-acre Rancho La Barranca in the northern state of Coahuila Sunday evening and abducted the five, including customs broker Librado Piña Jr., 49; his son, Librado Piña III, 25; Sweetwater businessman David Mueller, 45; and two Mexicans — ranch cook Marco Ortiz and Monterrey resident Fidel Rodriguez Cerdan. Though details were sketchy Tuesday night, U.S. officials and...