Eight people have been found dead in a tractor-trailer outside a Walmart in Texas in what police are calling a horrific human trafficking case.

Several other people have been taken to hospitals.

San Antonio police say a Walmart employee was approached in a parking lot by a person from the truck who was asking for water late Saturday night or early Sunday morning.

Police say the employee gave the person the water and then called them and when they arrived they found the eight people dead in the back of the trailer.

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Police say they checked surveillance video, which shows vehicles had arrived and picked up other people from the tractor-trailer.

They say they're "looking at a human trafficking crime."

Police say the US Department of Homeland Security is involved in the investigation into what happened.

- AP