explosion at a waste water treatment works. Michael James, 64, Brian Vickery, 63, Raymond White, 57, and Luke Wheaton, 16, died in the incident at Wessex Water's Bristol water recycling centre in Avonmouth on Thursday.
It is understood that Mr James was a contractor working at the site, while Mr Vickery and Mr White were employees of Wessex Water and Luke was an apprentice at the firm.
Emergency services were called to reports of a large explosion involving one of the chemical tanks at the site at about 11.20am.The blast happened in a silo that held treated biosolids.Avon and Somerset Police, which declared a major incident, said a cordon at the site was likely to remain in place "over the coming days" as an investigation is carried.
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