A domestic helper from the Philippines was fighting for her life last night after an ambulance knocked her down in Sha Tau Kok. A green minibus was making a right turn into a branch road near Kan Tau Tsuen when an ambulance, with its siren on, collided with the vehicle at 8.10am, a police spokesman said. The ambulance mounted the pavement and hit a 39-year-old Filipino woman. It also knocked down a lamp post and tore away 15 metres of railing The maid was thrown several metres by the impact and suffered severe head injuries. She was taken unconscious to Prince of Wales Hospital and remained in critical condition last night. The 47-year-old ambulance driver and two male crew members, aged 28 and 31, sustained minor injuries and were taken to North District Hospital. They were in stable condition last night. The ambulance driver was later arrested for dangerous driving. He was released on HK$3,000 bail and must report back to police in the middle of March. The 57-year-old minibus driver said the ambulance had crossed double-white lines and overtaken four vehicles before the collision. He and four passengers were unhurt. Neither driver had been drinking, police said. A Fire Services Department spokesman said the ambulance had been sent at 8am to assist a resident at a home for the elderly near Sha Tau Kok. The maid's employer, from the nearby village of Kan Tau Tsuen, said she was waiting for a bus to a church in Fairview Park. The ambulance involved in the accident has appeared in a government promotional poster reading: 'Save Lives, Give Way to Ambulances.'