A Pennsylvania county coroner said Monday at least three people died in a collision involving more than 50 vehicles that closed a portion of the interstate and sent more than a dozen people to area hospitals.

Dr. David J. Moylan, the Schuylkill County coroner, said the search of the scene hasn't been completed because of the burning vehicles, but "I suspect it could run higher."

The crash in northeast Pennsylvania happened around 10:30 a.m. and John Blickley, the deputy emergency management coordinator for the agency, said officials believe a snow squall clouded visibility and likely contributed to the accident.

People whose vehicles were in the crash and the "walking wounded" were taken to the Wegman's distribution center in an industrial park near the crash, he said, and a reunification center had been set up at the Goodwill Fire Company in Minersville.

Footage uploaded to social media on Monday showed a tractor-trailer smash into a large dump truck, turning it nearly 180 degrees. Another large truck spewed black smoke and orange flames into the air and an SUV struck a passenger car sending the sedan spinning, narrowly missing its driver who stood on the shoulder of the highway shrouded in snow and fog.

The person who posted the video did not immediately respond to requests seeking additional information. People off-camera can be heard yelling as the cascade of crashes unfolds with multiple vehicles colliding in less than a minute.

The National Weather Service had warned of "numerous brief heavy snow squalls with very poor visibility."

"The squalls will quickly reduce the visibility to under one-half of a mile and coat the roads with snow," forecasters said, urging drivers to get off the road if possible or turn on hazard lights "and gradually slow down to avoid a chain reaction vehicular accident."

Mike Colbert, a forecaster with the National Weather Service office in State College, said the weather service started issuing warnings for snow squalls a few years ago, and pileups of the kind being reported were the reason they began doing so.

"They are very heavy snow showers where if you are driving into them, you can go from partly cloudy or sunny skies into an instant blizzard in a matter of seconds. That's why they are so dangerous," he said.

Blickley warned that the northbound section of the interstate will likely be closed "well into the evening" as the crash investigation and clean-up continues. He also cautioned that more squall warnings are expected throughout the afternoon and asked people to be careful and pull over if needed.

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