Police have issued a warning to youth who have been damaging boats moored in Thornton and Fleetwood.
A number of incidents have been reported in recent weeks , the majority involving gangs of young people who have been climbing onto vessels without permission.
A Lancashire Police spokesman said: "It has been brought to our attention that there have been a number of boats damaged on Skippool Creek, Thornton and also on Jubilee Quays, Fleetwood.
"The offenders are believed to be juveniles who are gathering in these areas, climbing on boats and being inconsiderate towards other peoples property.
Our investigations are continuing but if you have been in these areas and have seen anything suspicious or have any information regarding who the culprits may be please contact Lancashire Police on 101 or telephone Crimestoppers anonymously on 0800 555 111 quoting ref LC-20170507-0380