An accident turned into a four-car collision on Interstate 93 in Boston Thursday night, injuring one woman, when a vehicle initially struck a vacant State Police cruiser, a law enforcement official said.

The accident occurred at about 10 p.m. on the northbound side of the highway just before Exit 15, State Police spokesman David Procopio said in a statement.

A trooper was assisting a disabled vehicle in the right travel lane, Procopio said, and a second trooper parked farther behind the scene of the breakdown.

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The second trooper exited his vehicle to set up flares to warn drivers, and a 2002 Subaru Forester driven by a 24-year-old Walpole man crashed into his cruiser, according to Procopio.

“After this initial crash, a 1999 Toyota Camry being operated by a 20-year-old female from New Bedford collided with the Subaru Forester,” Procopio said. “Then, a Ford F-250 pickup truck, being operated by a 43-year-old male from South Boston, collided with the Toyota Camry.”

Procopio said only the driver of the Camry was hurt, and that she was taken to Boston Medical Center with minor injuries.

“The facts and circumstances of the crash are currently under investigation by troopers from the State Police Troop H Headquarters,” Procopio said. “Boston EMS/Fire Department and the Massachusetts Department of Transportation assisted at this scene.”

No one was initially charged criminally or cited in the accident.

State Police said on their official Twitter feed that one lane on the northbound side of the highway had reopened by about 11:15 p.m.

“One person with very minor injury,” State Police tweeted. “Trooper not injured. Expect delays.”