THE A346 has been closed to traffic after a serious crash between Swindon and Marlborough this afternoon.
The collision involved just one car, which struck a tree.
All three emergency services are in attendance and the Wiltshire Air Ambulance is also at the scene, with one female trapped in the wreckage.
Drivers should avoid seek alternative routes.
A spokesperson for Wiltshire Police said: “We received a 999 call just after 4pm to a report of a road traffic collision involving one vehicle which had collided with a tree on the A346. The road is blocked in both directions.
“One woman is reported to be trapped in a vehicle.
“Fire and ambulance have also been called to the scene.
“The road has been closed between Marlborough and Ogbourne St Andrew.
“It is likely to remain closed for several hours while the incident is dealt with.”