At least 10 migrants were killed in the accident, and more than 12 others were reportedly injured, according to the Associated Press, citing Sgt. Nathan Brandley of the Texas Department of Public Safety.
Brooks County Sheriff Benny Martinez confirmed that the driver was among the deceased at the scene.
Based on preliminary findings, authorities believe the driver of the van was speeding and failed to turn at the appropriate time, causing the individual to lose control and ultimately flip the van, which is top-heavy.
The Texas Department of Public Safety (DPS) shared some photos of the incident with media and confirmed 9 passengers plus the driver died.
The fatal accident is believed to have crashed just south of Encino, Texas, around 4:20 p.m. local time. The site is approximately 10 miles south of the Falfurrias Border Patrol Station.
Despite the driver's presumed speed in the van, the vehicle was not involved in a pursuit, authorities said. It is believed the van was overcapacity, as Martinez estimated the vehicle to be a 15-person van.
A number of injured individuals are being airlifted to hospitals in the Rio Grande Valley.