A collision which left an ambulance lying on its side has sparked a police appeal for witnesses.
Officers were called to Watford Road, near Chiswell Green in St Albans, at around 10.05am yesterday (Thursday, September 24) after a collision involving an ambulance and a Volkswagen Polo.
The ambulance, which did not have any patients on board, was responding to a 999 call when it was in collision with the Polo and ended up on its side.
An air ambulance and the fire service also attended the scene and the road was closed.
The two staff in the ambulance were taken to Watford General hospital, one with chest injuries and another with minor injuries.
There were two people in the car – a woman and her son.
The woman, in her 70s, was initially taken to Watford General by land ambulance and then transferred to St Mary’s Hospital in London with a serious head injury and suspected fracture.
Her 47-year-old son was flown to the Royal London Hospital with critical injuries.
Anyone who witnessed the incident is asked to contact PC Shona Gillen in the Forensic Collision Investigation Unit on 01438 757500.