A fatal multi-vehicle crash on San Antonio’s Interstate 35 on Thursday killed four people and left at least 16 more injured when a speeding stolen Camaro collided with a passenger bus.

The accident occurred when a stolen Chevrolet Camaro was being driven at high speed and crashed into a bus that was carrying a trailer. The collision caused the bus driver to lose control, hitting a guardrail. The bus was thereafter hit by another tractor-trailer. A number of the passengers were hurled from the bus because of the forceful impact.

According to the Associated Press, two bus passengers died at the scene, while two others succumbed to their injuries at a nearby hospital. Authorities said 16 additional victims, including seniors and children, were treated for various injuries at local hospitals.

San Antonio Police Chief William McManus noted that the bus carried a diverse mix of passengers, including minors and the elderly.

In a bizarre twist, police said several occupants of the stolen Camaro fled the scene without providing assistance. At least one person who escaped was allegedly armed. As of Thursday night, none of the suspects had been named or taken into custody.

Authorities are reviewing surveillance footage from nearby cameras and have asked the public to share any information that may assist in locating the suspects.

The San Antonio Police Department and other emergency responders continue to investigate the crash. Interstate 35 was closed for several hours while crews cleared the scene and treated the injured.

Officials described the crash as one of the worst in recent San Antonio history.

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With inputs from Associated Press