Police are hunting a driver after a hit-and-run crash in Thamesmead.

A vehicle was driven off after a man was knocked down in Twin Tumps Way at about 10.20am.

A Met Police spokesman said: "A vehicle collided with a male pedestrian, we think, aged in his 20s. It is not clear whether the injuries will be life-changing.

"The vehicle was driven away form the scene and officers are now under way in tracing it."

An air ambulance was also dispatched to the scene, and a large police presence was reported by witnesses.

A witness told News Shopper: "I saw the air ambulance fly over head, so I went to see where it was going.

"When I got to the roundabout by Morrison's I saw a sea of blue lights, two cars stationary and crowds gathering.

"As I got closer I could see a black man laying in the road surrounded by paramedics and the trauma doctors from the helicopter.

"They were working on him at the roadside for quite a while before they were able to get him to a position that he could be put on to a stretcher and that's all I know, I left at that point."

A spokesman for Abbey Wood police said: "Please avoid Thamesmead town centre. Serious road traffic collision."

Buses are being diverted away from the scene. TfL said: "Routes 244 472 and B11 are diverted in the Thamesmead due to a traffic collision in Central Way. Routes 244 & 472 are being diverted via Eastern Way and route B11 starts and terminates at Boiler House."

Police told News Shopper that the road is expected to be closed in both directions until 6pm this evening. 

We will be updating this story with more information as we get it.