A MAIN road from Didcot to Wantage has been blocked off by an ambulance this morning. 

*UPDATE*: Read our story here. 

Motorists have warned on social media that the A417 is closed, just past the Ardington turning. 

One person speculated that there had been a crash between a cyclist and car.

Others said they had seen an air ambulance circling the skies.

Highways England traffic feed shows gridlock and slow-moving traffic in the area. 

South Central Ambulance Service has been asked to comment. 

Thames Valley Police refuse to comment on road traffic collisions.