A tractor-trailer rolled over on top of a car in Westford, Massachusetts, pinning the driver of the car inside.
The accident occurred shortly before noon in the area of 237 Littleton Road, according to the Westford Fire Department.
Emergency crews worked to free the driver, who was taken to a local hospital.
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The extent of the driver's injuries is not yet known.
Aerial footage from NBC Boston's Sky Ranger helicopter showed the truck's cab and the car with extensive damage, with what appeared to be a downed utility pole resting across them.
Powers Road at Littleton Road and Boston Road at Littleton Road was temporarily closed due to the accident.
No further information was immediately available.