In Veracruz, Mexico, scores of migrants who were left by human smugglers in an abandoned freight trailer on the side of a highway had to break their way out to avoid suffocation. On Wednesday, people at a nearby gas station discovered the migrants after they bashed holes in the trailer’s roof. Medics treated survivors for knee and ankle injuries.

Cristóbal Cisneros Valencia: “We were told there were close to 400 immigrants traveling in the trailer. When they started to feel suffocated, they broke through the roof of the trailer, and most of them jumped out. That is why most of the injuries we treated were ankle and knee fractures.”

The migrants are from Guatemala, Honduras and El Salvador. This comes a month after 53 migrants from Central America and Mexico died in San Antonio, Texas, after they were left in a sweltering, abandoned trailer.