SAN ANTONIO — A multi-agency investigation is underway after a body was discovered near railroad tracks in Southwest Bexar County on Monday afternoon.

The body was discovered by authorities near Pue and Wolf Road around 1:30 p.m., according to BCSO.

BCSO said on Saturday, a woman who was traveling on a train that originated from Del Rio called her sister, who was out of state, and told her the boxcar was overheating.

Her sister reported this and the San Antonio Police Department responded but did not find anything on Saturday, sources said.

When the train arrived in San Antonio, the train split. Some boxcars went to Laredo while some went to other destinations.

RELATED: Six people confirmed dead in Union Pacific cargo train at Laredo railyard

We’re told six people that were found in a Union Pacific train in Laredo on Sunday afternoon are believed to have been connected to the train that originated in Del Rio and split in San Antonio.

BCSO tells us that a sensor was tripped and near there is where they found the body of a male this afternoon, who is believed to have been on the same train that originated in Del Rio.

The Bexar County Medical Examiner is working on identifying the man. Sheriff Salazar said the man was in possession of a Mexican voter registration card.

Investigators believe the man was being smuggled. We have reached out to Homeland Security Investigations, who is now the lead agency investigating both cases.

BCSO says charges are pending. No arrests have been made as of yet. Union Pacific is also investigating.

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The sheriff will hold a press conference this afternoon.