In a series of tweets posted at around 11.30am, Lincolnshire Police said: "We are currently responding to an incident in Hubbard’s Hills, Louth.
"An off-duty Lincolnshire Police officer has been injured. His injuries are not thought to be life-threatening.
"It is believed that the individual responsible may be Daniel Boulton, who is wanted in connection with a murder in the town last night.
"Please do not approach him if you see him and instead call 999, and please avoid the Hubbard’s Hills area for the time being."
More on this breaking news story as we have it...