At least 42 people were found dead in a trailer truck in San Antonio, Texas, the state governor and local media said on Monday.
Governor Greg Abbot said in a tweet that the people were found in the back of a truck and blamed the deaths on political division and how borders are secured.
San Antonio's WOAI-TV said that police were investigating. KSAT-TV said the truck was found next to railroad tracks in the city's Southwest Side neighborhood.
San Antonio police didn't respond immediately to a request for comment.
Mexico's foreign minister Marcelo Ebrard said the Mexican consul was on the way to the site Monday.
In a tweet, Ebrard said that the victims' nationalities were still unknown.
The Mexican consulate in San Antonio said on Twitter that it would give aid to any Mexicans involved in the incident, if there were any. It also said that consul general Ruben Minutti was on the way to the scene.
A KSAT reporter posted photos to Twitter showing multiple police vehicles and ambulances surrounding a large truck.