Udupi, Jul 20: In a grisly road accident, a speeding ambulance skidded and crashed against a toll plaza at Shiroor in Byndoor taluk of Udupi district today killing four people on the spot. Four others suffered critical injuries in the horrific incident, the CCTV footages of which went viral on social media.  In the video, the ambulance can be seen swerving and crashing into the toll gate as the driver lost control over the vehicle. The vehicle overturned, throwing the patient and attenders out of the vehicle after hitting a pillar at the toll gate. The deceased have been identified as Gajanana Naik (45) the patient, Manjunath Naik (40) Lokesh Naik (42) and Jyothi (32). The driver of the ambulance has been identified as Roshan. All the injured were rushed to the hospital for treatment. Among those injured, the condition of one person is learnt to be critical. The injured include toll gate staff Shambhaji Gorpade. The tragedy occurred when the ambulance was reportedly carrying a patient and was on its way from Honnavar to Udupi.  The patient was undergoing treatment at a private hospital in Honnavar and was later referred to a hospital in Udupi for treatment. Police sources said that eight people, including the driver, were travelling in the ambulance. The accident was captured in CCTV cameras at the toll gate. Though the staff at the toll gate tried to clear the way for the ambulance, the driver failed to control the vehicle and hit the toll plaza before it toppled. Byndoor police have visited the spot and an investigation is under progress.