Dozens of migrants found dead in truck in Texas

The bodies of 46 dead migrants were discovered inside a tractor-trailer on Monday in San Antonio, Texas, city officials said, in one of the most deadly recent incidents of human smuggling along the U.S.-Mexico border.

A San Antonio Fire Department official said they found "stacks of bodies" and no signs of water in the truck, which was found next to railroad tracks in a remote area on the city's southern outskirts.

Sixteen other people found inside the trailer were transported to hospitals for heat stroke and exhaustion, including four minors, but no children were among the dead, the department said.

"The patients that we saw were hot to the touch, they were suffering from heat stroke, exhaustion," San Antonio Fire Chief Charles Hood told a news conference. "It was a refrigerated tractor-trailer but there was no visible working A/C unit on that rig."

Temperatures in San Antonio, which is about 250 km from the Mexican border, swelled to a high of 39.4 degrees Celsius on Monday with high humidity.

The city's Police Chief William McManus said a person who works in a nearby building heard a cry for help and came out to investigate. The worker found the trailer doors partially opened and looked inside and found a number of dead bodies. McManus said this was the largest incident of its kind in the city and said three people were in custody following the incident, though their involvement is not yet clear.

The I-35 highway near where the truck was found runs through San Antonio from the Mexican border and is a popular smuggling corridor because of the large volume of truck traffic, according to Jack Staton, a former senior official with ICE's investigative unit who retired in December.