Kent Fire and Rescue Service say that a motor launch which caught fire at the Strood Yacht Club near Rochester has sunk.
It was initially thought that another two boats were also ablaze but firecrews have now made the scene safe and handed it back to the care of the yacht club.
A statement from the fire service said: "The motor launch has been too badly damaged by fire and has sunk."
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Monday's weather for the east of the region
Monday's weather for the west of the region
The South of England is set to enjoy milder temperatures and is expected to escape heavy snow forecast for the rest of the country.