IN PICS! Six dead, 65 injured after 100 vehicles pileup on icy Texas interstate

At least six people are dead and dozens more were injured in a massive pileup on an icy Texas interstate that involved more than 130 vehicles Thursday morning, officials said.

"This is a major catastrophe in our city," Fort Worth fire spokesman Mike Drivdahl said of the ice-related crash.

It was dark and cold with freezing rain when first responders arrived to the scene after 6 a.m. on Interstate 35, an ambulance service official said.

Thirty-six people were transported to hospitals, and others later sought treatment, officials said. Multiple people were trapped in cars, and fire crews used hydraulic rescue equipment to rescue them.

Buses were called in to shelter the stranded from the cold."Our thoughts and prayers are with everybody involved with this incident," Drivdahl said.

Three Fort Worth police officers en route to work were hurt but not seriously, and many of the victims appeared to be health care workers, officials said.

"We did see a large number of people that were victims of this accident, that were in scrubs, that had hospital IDs on," Matt Zavadsky, spokesman for the ambulance service MedStar, said.

Video posted to social media shows a tractor-trailer sliding at high speed into traffic. The crash led to others and sent some vehicles into the air. Fort Worth Police Chief Neil Noakes said Thursday afternoon that 133 vehicles were involved in the accident, but added that was not a final number.