Four victims were pronounced dead on the scene and a fifth was pronounced dead after being airlifted to a hospital in San Antonio, Boyd said.
The crash occurred at about noon during a chase that reached speeds of 100 miles per hour, reports say.
This article be updated as more details become available. People from both vehicles were arrested, according to the statement. Authorities believe the driver and one passenger are U.S. citizens and the 12 other passengers were undocumented immigrants, Boyd said. The Agency added that the incident is now being investigated by Homeland Security Investigations, the US Border Patrol, Texas Department of Public Safety, Dimmit County Sheriff's Office, and Customs and Border Protection's Office of Professional Responsibility. "I think we need a wall in my opinion".
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The other 12 passengers were undocumented immigrants, Boyd said.
The crash Sunday morning on Highway 85 in Big Wells was the result of a chase that involved Border Patrol agents and Dimmit County deputies.
"This, I think, is a flawless example, of why are borders need to be secured", Boyd said.
5 immigrants killed in rollover crash in Dimmit, Texas. The Trump administration has said tougher immigration policies - even separating children from their parents - are needed to deter immigrants from coming to the country illegally. Dimmit County Sheriff office took up the chase, trying to halt the vehicle, which was going over 100mph.