There have been "multiple casualties" after a large explosion at a warehouse near Bristol.
Emergency services were called to the scene in Avonmouth, a port area to the north west of the city, at around 11.20am and are still looking for people.
Avon Fire and Rescue Service said they were called to reports of the blast on Kings Weston Lane, Avonmouth, and have been joined at the scene by Avon and Somerset Police officers and South West Ambulance Service medics.
A fire service spokesman said: "We have been called to a large explosion at 11.22 in a warehouse in Avonmouth on Kings Weston Lane.
"Crews from Avonmouth, Southmead, Yate, Patchway, Kingswood and Temple are currently attending. We can confirm there are multiple casualties on site.
"We are joined by Avon and Somerset Police and the Ambulance service on site. The incident is ongoing."
Witness Jawad Burhan took a photo showing a tank that had exploded after the blast.
He told the PA news agency there was a "helicopter looking for missing people" and police had closed a nearby road leading up to the building, which he believed was a waste centre.
He said: "I heard the sound, I'm working beside the building in another warehouse. After ten minutes I saw the helicopter coming and the police."
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South Western Ambulance Service said it "is responding to a serious incident at premises on King’s Weston Lane, Avonmouth, Bristol."
The service added: "We have attended with multiple resources alongside fire service and police personnel.
"For more information, please contact police quoting log 299."
