CCTV evidence showed that soon after that a white vapour was seen to
emanate from the bund around the tank. In the windless conditions this vapour
cloud, which was likely to have been a mixture of hydrocarbons and ice crystals,
gradually spread to a diameter of about 360 metres, including areas off the HOSL
site. This included a car park on the Maylands Estate, and onto the BPA north site
where Tank 12, containing aviation kerosene, was situated