BOURNE, MASS. (WHDH) - A serious, head-on crash Tuesday closed the Sagamore Bridge in Bourne in both directions for nearly two hours during the morning commute.

State police say troopers responded to the crash just before 7 a.m. and found four vehicles that were involved, including a tractor-trailer truck.

Two people were taken to the hospital with serious injuries, police say. Their condition is not known.

Police urged motorists to seek alternate routes as crews worked to clear the scene. The bridge reopened around 8:30 a.m.

Traffic was diverted to the Bourne Bridge.

The cause of the crash is under investigation.

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