Dozens of migrants were reportedly found dead inside an 18-wheeler in San Antonio, Texas, on Monday. Above, police are shown pulling over a semi-truck in this unrelated file photo.
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At least 40 migrants were reportedly found dead inside a tractor-trailer in San Antonio, Texas, on Monday.

They were discovered inside an 18-wheeler near railroad tracks in San Antonio’s Southwest Side neighborhood, according to a Reuters report citing a law enforcement official. An unconfirmed report from San Antonio ABC affiliate KSAT put the death toll at 42, based on unidentified police sources.

A spokesperson for the Bexar County Sheriff’s Office confirmed to Newsweek that the San Antonio Police Department was responding to the incident, while the Department of Homeland Security Investigations (HSI) would be the lead agency in the probe.

Newsweek reached out to the San Antonio Police Department, the Texas Department of Public Safety and the Department of Homeland Security for additional information and comment.

There have been multiple incidents of undocumented migrants being found inside semi-trucks in Texas in recent years, presumably due to human smuggling. In 2017, nine people were found dead, with 20 others hospitalized after they were discovered packed into a tractor-trailer in a Walmart parking lot in San Antonio.

This is a developing story and will be updated as more information becomes available.