Six bodies were found on Sunday in a train boxcar at a Union Pacific rail yard in Laredo, Texas, ⁠according to police.

Heat stroke may have led to the death of all six people, who are believed to be immigrants, according to a South Texas medical examiner.

The people were found as workers were inspecting one of the containers, said Jose Baeza, a spokesperson for the Laredo Police Department.

Five men and one woman were discovered, Baeza told reporters.

Dr. Corinne Stern, the Webb County Medical Examiner, is conducting autopsies and has completed one for a 29-year-old Mexican woman who died of hyperthermia, or heat stroke. “I’ve ruled that an accidental death,” she said.…