In Casa Grande, emergency crews worked more than an hour to free an unidentified woman from a car after a 12-vehicle crash Monday on Arizona 387. Four of the injured were flown by helicopter to Phoenix-area hospitals for treatment; three were treated at the scene and released.

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Four injured people were flown to hospitals Monday morning after a 12-vehicle collision that occurred in Casa Grande when a tractor trailer rear-ended a dump truck, an official said Monday.

Around 7:45 a.m. the Casa Grande Police Department was called to North Pinal Avenue just south of Interstate 10 and found 12 vehicles, including four commercial vehicles, involved in a crash, said a department news release.

The initial investigation revealed that a tractor trailer headed south on Pinal Avenue had rear-ended the dump truck, pushing it into several other vehicles up ahead, the release said.

The dump truck landed on top of a Ford Mustang on the shoulder of the road, trapping a woman inside, the release said.

Those with injuries — none of them life-threatening — were taken to Phoenix hospitals for treatment, the news release said.

Any criminal charges or traffic citations will await the outcome of the investigation.