EL CENTRO, Calif. - Fifty-five illegal immigrants from Mexico were found in a refrigerated truck with an internal temperature of only a few degrees above freezing, the U.S. Border Patrol said Tuesday. The migrants had crossed the U.S.-Mexico border near Yuma, Ariz., Monday and had been in the truck only a half-hour or so when they were found, said Border Patrol Agent Amber Galloway. The men and women appeared to be in good health, Galloway said. They were being held at the Calexico, Calif., Border Patrol station where they will be processed and returned to Mexico with a warning. A...