BOSTON -- A Massachusetts state trooper suffered serious injuries when his car was rear-ended by an intoxicated driver, state police said.

The accident happened at 9:26 p.m. on Saturday, as two troopers were assisting a disabled vehicle in the left lane of the Massachusetts Turnpike, near exit 17.

The troopers were both inside of their vehicles when a 2007 Jeep Cherokee crashed into one of the police vehicles. The trooper whose car was struck is being treated at Beth Israel Deaconess Medical Center.

The second trooper was not injured in the accident.

The driver of the car, Timothy J. Barletta, 41, of Dedham, was treated at Brigham and Women’s Hospital after being injured in the crash.

Police charged Barletta with operating under the influence. Additional charges may be filed against Barletta after an investigation into the crash.