A driver, whose friend was seriously injured in a car crash in Sai Kung yesterday, fled the scene with the number plates instead of alerting the police. A 21-year-old passenger was fighting for her life in Queen Elizabeth Hospital after being seriously injured when she was thrown out of the vehicle on impact. Two other passengers were also hurt. 'The female passenger flew out of the car and rolled down a slope and the driver fled,' said a police spokeswoman. The accident happened at 2am when the driver of a Mitsubishi Lancer, heading east along Tai Mong Tsai Road, lost control near Tai Wan in Sai Kung. The swerving vehicle smashed a 6-metre section of a metal barrier in the opposite lane before it bounced back into the road it was travelling in. It stopped when it hit another car parked next to the road. Passers-by saw the wreckage and notified the police. Sources at the scene said they saw the 23-year-old driver, who was not hurt, remove the front and rear number plates from his car before leaving in an apparent attempt to conceal the owner's identity. The driver turned himself in to the police about three hours after the accident. 'When asked why he ran away he claimed he was scared after the crash,' the police spokeswoman said. Tests showed the driver had been drinking before the accident happened, but the amount of alcohol in his blood was below the legal limit. Police have not arrested the driver. Traffic branch officers of the Kowloon East Division were still investigating the case before taking further action. The two other injured passengers, a man and women, were taken to Tseung Kwan O Hospital after the accident for treatment.