A 10,000-lb (4.5-tonne) chunk of concrete was left wedged on the glass atrium of a bus and underground station after a motorist deliberately drove into the wall of a rooftop car park.

The shocking incident in which a young girl was injured from falling glass happened at the Massachusetts Bay Transportation Authority intermodal transit station in the North Cambridge neighbourhood of Cambridge, in the US state of Massachusetts, at 1:30 pm on Saturday, 4th February.

The Cambridge MA Fire Department responded to an accident report and discovered the car balancing from the top floor of the MBTA station, while the driver, who is believed to have deliberately driven into the concrete barrier, was still behind the wheel, but unconscious. The motive for the act was not revealed.

According to Transit Police, the driver smashed the 10,000-lb concrete block over the edge where it was left wedged on the building’s glass roof.

The fire chief of Cambridge MA Fire Department, Tom Cahill said: “Somehow the atrium was able to support the 10,000 pounds and that piece of the concrete barrier remains being suspended by the steel atrium as we speak.”

Other parts of the concrete debris fell from the garage and smashed glass panels above the station’s entrance, damaging the hand of a young girl in the lobby, who was taken to the hospital.

According to the MBTA’s official Twitter account, Alewife Station was set to be closed at least until today, Monday, 6th January, as personnel clean up and assess the structural stability of the structure, while shuttle buses will replace Red Line service between Davis and Alewife.

The MBTA advised garage customers to seek alternative parking locations. Drivers with automobiles already parked in the garage may retrieve them.