Dozens of people were found dead on Monday in a tractor-trailer in San Antonio.Lisa Krantz for The New York Times

WASHINGTON, Broadcasting News Corporation : The death toll from a scorching-hot tractor-trailer found in the Texas sun rose to at least 50 people yesterday. At least 16 people were taken to hospitals in San Antonio, suffering from apparent heat exhaustion and dehydration. Several later died. The victims were believed to be migrants trying to cross into the U.S. from Mexico. Officials suggested that extreme heat most likely contributed to their deaths. Authorities took three people into custody and were working to identify victims. Mexico’s foreign minister said on Twitter that the dead included 22 Mexicans, seven Guatemalans and two Hondurans. Others have not yet been identified. All of the victims were believed to have crossed into the U.S. illegally. News collected from The New York Times.