Dyfed-Powys Police summer raves warning to farmers
Farmers and other landowners are being urged to watch out for illegal gatherings such as raves being planned on their land this summer.
Dyfed-Powys Police said social media made it easier for organisers to "spread the word" about unlicensed events.
Communities are being asked to report any suspicious activity.
This may include unusual numbers of vehicles gathering or trespassers looking for potential sites.
Nigel Hayes, police licensing officer for Pembrokeshire, said: "Members of the public are also urged to be vigilant of persons who approach landowners or inquiring for land, in the guise of hiring for apparently acceptable activities such as gymkhanas and scouts/guides events."
Police said there was no specific evidence of illegal gatherings being planned at this stage.
Parents are also being asked to be aware of the dangers of their children attending unsupervised beach parties which police said can attract large numbers of young people "with considerable amounts of alcohol in their possession".