A major incident was declared on Tuesday morning, which saw a "significant number" of police, fire and ambulance crews sent to the scene in Bridgwater, but this has now been stood down.

Giving an update on the situation, Inspector Rebecca Wells-Cole said 54 patients were triaged by paramedics and 26 were treated as "walking wounded".

She added that a number of people have been taken to hospital, but it was too early to confirm if their injuries were life-threatening.

No fatalities have been recorded.

The bus was taking workers to Hinkley Point C nuclear power station at the time of the incident, which also involved a motorcyclist.

A total of 70 people were on board when the bus "rolled over", Devon and Somerset Fire and Rescue Service confirmed.

Somerset Passenger Solutions, which operates the bus service, said an investigation into the "root cause of the accident" is now underway, and it is working closely with emergency services".

"We are supporting our colleagues and passengers who were involved in the incident," it said in a statement.

Avon and Somerset Police said officers were called at around 6am to the A39 Quantock Road following a "road-related incident involving a double-decker bus and a motorcyclist".

"Closures are in place at the junction of Sandford Hill and Quantock Road," it said in a statement.

"A significant number of police, fire and ambulance units are on the scene and a major incident has been declared."

Police warned of 'extremely icy' conditions earlier

The A39 is a major thoroughfare around the Quantocks - linking the M5 with places like Minehead and Exmoor – and is also a key road for people who work at the nuclear power station.

However, Hinkley Point C has said travel to and from the site has now been suspended.

Confirming paramedics were dealing with the incident, Southwestern Ambulance Service advised drivers to find alternative routes and "take care" while travelling due to roads being icy.

Avon and Somerset Police had earlier warned about the "extremely icy and dangerous" conditions following freezing temperatures after receiving more than 100 reports of road-related incidents in five hours.

A total of 53 crashes were reported to the force between 6pm and 11pm on Monday, and injuries were recorded in seven of them.