The reason why the M4 was closed on Tuesday morning has been revealed.

The M4 westbound between junctions 15 and 16 was closed at around 7.30am on Tuesday, January 22, by National Highways due to a 'police-led incident'.

The closure, which lasted for just under an hour, caused significant delays for rush-hour motorists travelling to work, but the reason for the closure was unclear.

Police dogs and helicopters were also spotted at the scene, adding to the confusion.

Avon and Somerset Police, who were dealing with the incident, have now confirmed that the motorway was closed following a stolen car police chase where the suspect made off on foot.

The suspect is still yet to be found.

"Avon and Somerset Police officers on patrol on the motorway identified a suspected stolen vehicle travelling along the M4 Westbound carriageway between Junction 15 and Junction 16  this morning," said a spokesperson for the police force.

"Officers used pursuit tactics to bring the vehicle to a safe stop, with support from colleagues at Wiltshire Constabulary.

"The driver fled the vehicle across the motorway and made off from police.

"With support from the dog unit and National Police Air Service, a full area tour was carried out to ensure the suspect was no longer on the motorway network but officers were unable to locate him.

"The vehicle has been identified as stolen from our area and enquiries are ongoing."