Smoke billows out of the warehouse rocked by blast. Photo Evening Standard

A large blast at a waste treatment facility near Bristol in England has caused multiple casualties, according to Press Association, citing Avon Fire and Rescue services.

The Evening Standard said several people were injured after a large explosion ripped through a warehouse near Bristol.

The newspaper, quoting witnesses, said “at least ten ambulances” rushed to the scene along with police and fire crews from six different stations.

South Western Ambulance described the incident, which occurred on King’s Weston Lane, as “serious”.

The service said: “We have been called to a large explosion at 11.22am in a warehouse in Avonmouth on Kings Weston Lane.

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“Crews from Avonmouth, Southmead, Yate, Patchway, Kingswood and Temple are currently attending”.

“We can confirm there are multiple casualties on site,” a spokeswoman for Avon Fire and Rescue Service said, adding that injuries were serious.

“It’s very much ongoing,” she said.

The explosion took place at a waste treatment facility for the nearby city of Bristol, the spokeswoman added.

*The scene of blast was initially described as a warehouse.