Four people have died after a devastating explosion at a water treatment centre.
Emergency services were dispatched to Wessex Water's premises in Avonmouth, Bristol, at about 11.20am.
Avon and Somerset Police confirmed in a statement: "An explosion is believed to have occurred involving one of the chemical tanks at Wessex Water's Bristol water recycling centre.
"A rescue operation was subsequently led by the fire service, involving five appliances and two turntable crews and we can confirm there have been a number of casualties."
An eyewitness told the BBC they heard a "very loud explosion" that "shook buildings".
Another said they saw "around 10 ambulances driving to the scene".
Jawad Burhan told the PA news agency: "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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