Laredo: Six migrants, including a 14-year-old boy, were found dead inside a train boxcar in Laredo, authorities said Thursday. Three of the victims were Mexican, while the other three were either confirmed or believed to be Honduran, officials from those countries said.

According to Anadolu Agency, Laredo Police Chief Miguel Rodriguez stated that authorities suspect the migrants were victims of a human smuggling operation. He mentioned that federal officials are continuing to investigate the deaths.

Rodriguez noted that the train had departed from Long Beach on May 7 and reached Del Rio on Saturday. Authorities believe the migrants entered the boxcar at that point. The bodies were discovered after the train arrived in the Laredo area on Sunday afternoon.

Laredo Mayor Victor Trevino indicated that preliminary medical findings suggest the victims likely died of heatstroke several hours before being found.