As it happened: Four dead after silo tank blast - BBC News
Police say that the tank exploded on Thursday killing four and injuring a fifth.
Four people have died following an explosion at a waste water treatment works in Bristol, police have confirmed.

Firefighters were called to Wessex Water's premises in Avonmouth, Bristol, at about 11:20 GMT.

Emergency services are leading a rescue operation. The blast is thought to have involved a chemical tank, police said.

Chief Inspector Mark Runacres told a press conference at the scene three employees of Wessex Water and one contractor died in the incident.

“Emergency services were called at approximately 11.20am to reports of a large explosion involving one of the chemical tanks at the site off Kings Weston Lane,” he said.

“The fire service led the rescue operation but sadly, despite the best efforts of all those involved, we can confirm there have been four fatalities. This includes three employees of Wessex Water and one contractor.

“Specially trained officers have this afternoon made contact with each of the families of those individuals and informed them of the sad news.

“This is a tragic incident and our thoughts and sympathies go out to them.”