A fire involving a lorry carrying hay bales has caused the closure of the M4 in both directions between junction 16 and 17.

The closure is expected to remain in place for a considerable time and there are long delays.

Swindon Police said: "We are supporting colleagues from the fire service at the scene.

"Please seek an alternative route."

The fire service has advised the incident is a major hay fire.

Swindon Advertiser:

National Highways South-West tweeted: "Load keeps reigniting so unsafe to run traffic past scene until under control.

"We don't have a clear timescale to do this.

"If you're in the closure thanks for your patience. We will get you our in due course."

UPDATE: Trapped vehicles will be released in one lane in about an hour, according to National Highways South-West.

The M4 between junctions 16 and 17 will remain closed for a considerable time.

They tweeted: "We appreciate it is frustrating having. towait but we all want to ensure the fire is fully under control before letting the public drive past."