UPDATE (8 A.M.) - The Massachusetts State Police are investigating a serious crash on Route 24 northbound at Harrison Boulevard in Avon involving two vehicles, one of which struck a utility pole. One victim has suffered serious injuries.

There were downed power lines on the roadway as a result of the pole being struck. Route 24 northbound was closed at Exit 18 for several hours. All lanes have since been reopened.

The crash occurred shortly after 2 AM. An occupant of one of the vehicles, a woman approximately age 23, was ejected in the crash and has been transported to Massachusetts General Hospital by medical helicopter with serious injuries. She is believed to have been the passenger. A second occupant of the same vehicle, a woman believed to have been driving, was transported by ground ambulance to Good Samaritan Hospital in Brockton.

Preliminary investigation suggests that following an impact with another car, the vehicle that those victims were in continued to travel off the road, where it struck trees and the utility pole.

The operator of the second car, a man, was transported by ground ambulance to an area hospital.

The cause of the crash remains under investigation by Troop H of the Massachusetts State Police with assistance from the MSP Collision Analysis and Reconstruction Section and the MSP Crime Scene Services Section. The results of the investigation will determine whether charges are sought against anyone involved.

A utility company crew also responded to the scene to remove remove the active power lines from the roadway.

Troopers from Troop D have been diverting traffic off Route 24 northbound in Brockton, south of the crash scene.

No further information is being released at this time.

-Massachusetts State Police

UPDATE (6:57 A.M.) - Massachusetts State Police say Rt. 24 North in Avon has been reopened to traffic after clearing a serious crash early Friday morning.

State Police say drivers should still expect heavy delays through that stretch of Rt. 24.

(6:22 A.M.) AVON - Massachusetts State Police have shut down Rt. 24 North in Avon after a serious crash early Friday morning.

Multiple media outlets report at least two vehicles were involved in the crash near Exit 19 in the northbound lanes en route to Boston. One car veered off the highway and struck a telephone pole, tearing the car in half.

A medical helicopter was called to the scene to transport at least one victim to an area hospital. Two other victims were transported by ambulance.

The northbound lanes of Rt. 24 remain closed at this hour, with only one southbound lane open.

Traffic northbound on Rt. 24 is being diverted to Routes 138 and 139 via Rt. 27.