A tractor-trailer was found near the Lackland Air Force Base in San Antonio which contained around a 50 dead bodies while 16 others have been taken to the hospital.
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Mayor of San Antonio, Ron Nirenberg said, "This is nothing short of a horrific human tragedy."
As per the official, local authorities are investigating the case and that three people are held in custody, but it remains unclear if they were connected to the tragic incident.
A U.S. Immigration and Customs Enforcement spokesperson said Homeland Security Investigations is leading a criminal investigation with the support of San Antonio police.