A driver injured a state trooper and four others after slamming into a state trooper's cruiser early Saturday.

Around 2:20 a.m., the driver, a man from Everett, Massachusetts, rear-ended a trooper's parked cruiser on Interstate 93 near exit 18 in Boston, the Boston Herald reported.

The trooper, who remains unidentified, suffered a concussion and was treated and released from Massachusetts General Hospital Saturday. The driver is being treated for serious injuries at Tufts Medical Center.

Two passengers, 27 and 29 years old, were sent to Boston Medical Center with serious injures. A third passenger was sent to Massachusetts General, also with serious injuries.

"Every motor vehicle stop, and every response to a crash, puts troopers, police officers, and emergency and maintenance responders at risk for their own safety," State Police Superintendent Col. Richard D. McKeon said in a statement. "We are very grateful to these professionals for the dangers they accept routinely as part of doing their jobs."

The driver is expected to face charges, and an investigation into the cause of the crash is underway.