The Texas Department of Public Safety is investigating a fatal crash involving at least two vehicles that hampered traffic for several hours on Monday in La Salle County.

DPS and the La Salle County Sheriff’s Office responded around 3:50 p.m. for an at-the-time possible fatal crash on Interstate 35 near mile marker 55 in La Salle County, the agency said Monday evening in a statement to KSAT.

When DPS and La Salle County deputies arrived at the scene, they found a Ford pickup truck and the semi-trailer portion of a tractor-trailer fully engulfed in flames.

Investigators believe the pickup truck collided with the back of the trailer while both vehicles were traveling northbound. It is unclear whether speeding was a factor.

On Tuesday morning, a spokesperson for DPS’s South Texas regional

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