A Burlington Police Department reserve officer working a detail was struck by an SUV and thrown on top of the vehicle, seriously injuring him, authorities say.

Retired Sgt. Timothy Kirchner left full-time duty in June after 32 years of service but remains with the department as a reserve officer, according to a department statement on the collision.

Kirchner was working a detail shift with one other officer around Eversource utility work at 34 Cambridge St. near a CVS when a 2016 Chevrolet Equinox SUV rushed over the curb and struck Kirchner, according to the department.

The other officer working the detail, who is not named, suffered minor cuts and scrapes but was not seriously injured. This officer “immediately jumped into action,” according to the department statement, to help Kirchner ahead of the arrival of Burlington Fire Department medics, who transported Kirchner by ambulance to Lahey Hospital and Medical Center.

The 75-year-old driver of the Equinox remained on scene and was cooperative, the department states. The Reading man told police that he was attempting to park when he accidentally hit the gas pedal.