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Orange/red flame and lots of black smoke suggests partially burnt fuel. What looks like a massive volume of water displaced in front of the flames suggests the bang happened at or under water level.
Fire pressurises then ruptures a storage tank sending a dense cloud of LPG above Upper Explosive Limit into the air. The cloud dilutes with air, coming below the UEL, meets flame and explodes.
Effectively a fuel/air explosive.
It's what we used to worry about living near the oil cracking plants in Middlesbrough.