SAN ANTONIO (AP) — Desperate families of migrants from Mexico and Central America are seeking word of their loved ones as authorities begin identifying 51 people who died after being abandoned in a tractor-trailer without air conditioning in the sweltering Texas heat. It was the deadliest tragedy to claim the lives of migrants smuggled across the border from Mexico. U.S. Rep. Henry Cuellar of Texas told The Associated Press that the driver of the truck and two other people were arrested. The bodies were discovered Monday afternoon on the outskirts of San Antonio when a city worker heard a cry for help from a truck parked on a lonely back road.