"The vehicle was traveling around 100 miles an hour", Boyd said.
Four victims were dead at the scene, according to the Texas Department of Public Safety. Authorities believe the driver and one passenger are United States citizens and the 12 other passengers were undocumented immigrants, Boyd said. The driver was among those hospitalized, and a deputy who assisted the Border Patrol with the chase found the driver sitting upright in his seat and took him and the passenger into custody.
Footage of the crash showed four bodies on the ground, the charred Chevrolet and several Border Patrol vehicles at the scene.
Boyd said a total of 14 people were inside the SUV and several were ejected out of the vehicle when it rolled onto Highway 85.
Some of the injured passengers were flown by medical helicopters to hospitals in San Antonio, and others were taken by ambulances to a hospital in Dimmit County.More news: Giuliani denies report that Michael Cohen may cooperate with investigation
Border Patrol agents attempted to stop the vehicle when the chase ensued and were soon joined by Dimmit County deputies, KFDM reported. "We dealt with him last week", Boyd said.
When asked why Border Patrol agents started the chase, Boyd said, "It's called good police work".
Authorities are investigating the scene where a vehicle full of undocumented immigrants being chased by Border Patrol agents crashed.
Boyd said there needs to be a wall built because this is a "real problem" in the area.
Yolanda Choates, a U.S. Customs and Border Protection spokeswoman, directed questions to the Dimmit County Sheriff's Office.