A sport utility vehicle packed with at least 19 suspected illegal immigrants crashed after a high-speed chase with authorities, killing three immigrants and sending 12 others to hospitals.

The chase started in Natalia, about 30 miles southwest of San Antonio, and reached San Antonio around 2 a.m. at speeds over 100 mph, said police Sgt. Gabe Trevino.

The vehicle blew a tire and rolled several times, ejecting the occupants. At least two people fled on foot before being caught with the aid of a police helicopter, Trevino said. The driver was taken into custody and could be charged with capital murder, Trevino said.

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San Antonio police could not say on Monday what started the chase. Natalia police did not return a phone message.