Eyewitnesses with cameraphones filmed a mystery luminescent, tentacled being, which was flashing a variety of colours, floating close to the top of the water in Bristol Harbour last night.

Marine biologists admit they don't know what it is, but claim the footage could be a marine salp which had drifted off course by the weather. Let's face it, it's probably that. It'd be cool if it was an alien though.