AN accident has blocked part of Thamesdown Drive.

Traffic is queueing northbound on the A4198 near the Tawny Owl turn-off and traffic lights.

A witness reports seeing a car on its roof on the intersection and an air ambulance.. Six police cars are at the scene along with fire engines and a land ambulance.

A Wiltshire Police spokesman said: "We are currently dealing with a single-vehicle collision on Thamesdown Drive, at the junction with Queen Elizabeth Drive, with our colleagues @DWFireRescue  and @swasFT

"The road is blocked on one carriageway towards the Orbital. Please avoid this area if you can. Thanks."