Police warned that they wanted parents of the young people involved to take responsibility for their children and to actively discourage the disruptive behaviour.
Town council clerk Mark Williams said some peoples behaviour had been very poor over the weekend.
Branches were ripped out of the hedge Litter debris is an issue for marine wildlife and beach safety, he said. Beach fires present a real hazard, are often left burning into the next day, and are often fuelled by materials damaged and stolen from nearby properties and businesses. Hot debris, nails and other hazards are left in the sand. The rule of six is applicable to outside gatherings.
Read next: He said Cornwall Council are the beach custodians but are stretched in terms of enforcement response.