A boat was engulfed by flames on Fosse Dyke, requiring a large emergency response.
The boat was moored up at Roman Wharf and the fire started to take hold at around 2pm on Tuesday, December 10.
Lincolnshire Fire and Rescue has put out the fire by 3pm and is investigating reports that the blaze was started deliberately.
One reader reported that the boat had been used as shelter by a homeless person, but this has not yet been confirmed.
It is not yet known if anyone has been injured in the blaze.
The Lincolnite has also contacted Lincolnshire Police for a comment, but has had no response at the time of writing.
Update: Lincolnshire Police has confirmed that nobody was on the vessel when the fire started and are not treating it as arson at this stage.
A spokesperson added that there had been no injuries or arrests.
This is a breaking news story and will be updated when we get more information.