A 17-vehicle crash in Austin, Texas, left five people dead, including a child and an infant, first responders say. 

The massive pileup involving a semi-truck unfolded late Thursday night along I-35 in the North Austin area, according to Austin-Travis County EMS. 

The agency said several people were “pinned in their vehicles” following the wreck. 

“5 patients (3 adults, 1 child, 1 infant) have been pronounced deceased on scene,” Austin-Travis County EMS wrote on X. 

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First responders are seen early Friday, March 14, at the crash scene along I-35 southbound in North Austin. (KTBC)

The cause of the crash was not immediately clear. 

Of the 12 people who were injured, three of them are children, officials said. 

The portion of I-35 southbound where the crash happened appeared to be closed early Friday morning. 

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Several people were “pinned in their vehicles” following the crash late Thursday night, according to Austin-Travis County EMS. (KTBC)

“All lanes of N IH 35 SB are shut down and will be for several hours. Please avoid the area, expect delays, and find alternate routes,” the Austin Police Department wrote on X. 

Austin-Travis County EMS Captain Christa Stedman told CBS Austin that “This incident was incredibly chaotic and it was spread out over about a 10th of a mile.  

The cause of the fatal crash in Austin, Texas, was not immediately clear. (KTBC)

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“So without the collaboration of our partners, we would not have been able to manage the scene as well as we did,” she added.