A man is fighting for his life after being hit by a police van responding to an emergency call.

The 35-year-old was struck on London Road, near the junction with Thornbury Road in Isleworth , on Tuesday night (December 8) at around 10.55pm.

Police believe the van was responding to a 999 call in Brentford , and travelling with its blue lights in use, but without sirens.

The pedestrian was taken to hospital where his condition is described as critical. Next of kin have been involved.

The two police officers inside the van, the driver and operator, were not injured.

Buses ran on diversion following the collision.

Officers from the Roads and Transport Policing Command are appealing for witnesses, and detectives from the Serious Collision Investigation Unit are carrying out enquiries into the circumstances of the collision.

The Directorate of Professional Standards has been informed and the incident has been referred to the Independent Police Complaints Commission.

Anyone who saw the incident is being asked to call the witness line at the Serious Collision Investigation Unit at Merton on 020 8543 5157.