Nine undocumented immigrants died after being trapped inside a tractor-trailer at a Walmart parking lot in San Antonio, officials confirmed Sunday afternoon.
He confirmed that eight people were found dead when they arrived at the spot, whereas, 23 others were in critical condition, suffering from dehydration and heatstroke.
"Unfortunately, some of them were severely overheated, and that was a refrigerated truck with no refrigeration", said San Antonio Fire Chief Charles Hood.
Other details are unknown as yet and they will be updated soon as they come.
The driver has been arrested, according to San Antonio police, and will be facing state and federal charges.
In all, 39 people were inside the truck.
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It was not immediately clear how many people made it off the truck alive, McManus said. He said they had no water and that the air conditioning in the truck was broken.
Officials said many of those inside the truck were adults aged in the 20s to 30s as well as what appeared to be two school-age children. Hood also said that some of those with injuries related to heat stroke may result in brain damage, CNN reported.
Video footage from the store showed a number of vehicles arriving to pick up some of the survivors, he added.
The Department of Homeland Security is assisting in the investigation. "And fortunately there are people that survived", McManus said.
The case will be passed on to US Immigration and Customs Enforcement, the police chief said, once victims have been examined.