Crews responded to a major rollover accident on I-495 northbound in Haverhill, Massachusetts, Thursday afternoon.
State police say a medical helicopter took an occupant of a vehicle to Massachusetts General Hospital with a serious injury, temporarily closing the northbound side of the highway. Authorities say the left lane is still closed at this time.
Traffic was delayed, but the scene was cleared and all lanes were reopened by 3:45 p.m.
There's no word on how many vehicles are involved in the rollover.
Stay with necn as this story develops.