A motorway has been reduced to two lanes following a multi-car crash.

Several vehicles are thought to have collided on the M4 between Junction 15 Hungerford and Junction 14 Swindon this morning. 

As a result, lane three of the motorway has been closed while emergency services attend.

National Highways South West confirmed the crash in an announcement on its Twitter page. 

It has warned motorists to allow for extra time if travelling between Hungerford and Swindon, stating that there are delays of up to 20 minutes and three miles of traffic trailing back. 

The full tweet reads: "Lane 3 is closed on the M4 westbound between J14 Hungerford and J15 Swindon due to a multi-vehicle collision. Please allow extra time if travelling in the area as delays of 20 mins and approx. 3 miles of congestion."

It is unknown how long the lane will remain shut, or if anyone was injured in the crash.