POLICE have said they are becoming "increasingly concerned" following a party attended by more than 100 children on a school sports field in St Austell.
Alcohol was seized and destroyed by officers and rubbish left strewn across the field, which belongs to Poltair School, after the mass gathering on Saturday evening.
PC Jon Hamley, neighbourhood beat officer for St Austell, said when officers arrived some of the children bolted in a bid to evade the law.
Mr Hamley has urged parents to be vigilant and keep their children away from the field while being aware of the risks of underage drinking.
"A lot of the older children had alcohol and that was seized and poured away," he said
"Antisocial behaviour and underage drinking will not be tolerated in St Austell."
The field, which is beyond the school's parameter and is used occasionally by students for team building exercises and athletics in the summer, is accessed from the school and Tremena Road.
Ross Mack, assistant head teacher, said "We are disappointed that a school asset and therefore a community asset is being misused."
He said the school is backing the call from police for youngsters to stay away from the field and asks instead that they "respect" what is a provision for its students.
"There has been no indication that any of the children were from Poltair School at this time.
"However, if it was found that they were involved , they will be dealt with appropriately", Mr Mack added.
Anyone with information should call PC Hamley on 101.