Aggressive cold callers have been targeting residents in the Skegness area, claiming to be deaf and selling personal artwork.
A number of incidents have been reported across East Lindsey, with the latest on Sunday in Holten le Clay.
On this occasion, a man called at an address in Louth Road and became physically aggressive when asked to leave.
Officers want to identify the people who are responsible for the sales and are asking members of the public to contact them if anyone calls at their door in similar circumstances or if they have been targeted already.
Residents are being urged to be on their guard against cold callers by be on their guard against cold callers by ensuring they keep front and back doors locked, even when at home, and being vigilant when answering the door - always use a door chain and don’t let any strangers into your house.
Anyone who believes they you have been targeted by the deaf artist, or by any other suspicious cold callers, should call police on 101
To report an incident in progress, or if you are targeted in the future, always call 999 straight away.