VIDEO: How the Robin Cousins sports centre was torched
This footage shows two men in balaclavas who started the blaze at the Robin Cousins sports centre in Shirehampton.
The arsonists can clearly be seen with a petrol can and feeding the fire with planks of wood.
The sports centre's owner, Bristol businessman Lee Adams, is desperately keen to see the arsonists caught and brought to justice.
He is urging anyone with information to contact the police on 101.
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Police confirmed that the fire was deliberately after the gutted ruins were examined by fire experts.
Mr Adams, who used the sports centre as a store for his garden furniture business, also runs a CCTV camera firm.
He had a number of cameras at the site as a security measure.
Mr Adams was insured on his garden furniture stock which he valued at £100,000 but the building was not insured.
He said its replacement value was about £1 million.
He said he had no idea why arsonists would want to torch the premises.
He said: "There are all sorts of rumours flying around including that it was an insurance job but I only had the stock insured, not the building.
"One of the theories flying around is because of talk about the premises being turned into a mosque or it might be personal against me but to be honest, I just don't know.
"I just want to see these arsonists caught."