South Northamptonshire Police gave three Banbury teenage boys community resolution disposals after they admitted their part in causing damages to play equipment in Middleton Cheney.
Police said the incident occurred between Friday January 29 and Sunday January 31 at the play area in Astrop Road, Middleton Cheney.
A spokesperson for South Northamptonshire Police said: "A small fire was lit causing some scorch marks. So damage was minimal, but either way unacceptable."
The youths involved, boys aged 14, 16 and 17, were each visited and spoken to with their families by police.
Community Resolution Disposals were issued and signed for during each visit.
The South Northamptonshire Police spokesperson described a Community Resolution Disposal as the 'first step on the ladder aiming to intervene and divert behaviour before they enter the criminal justice system.'
Each teenager and family also received a Covid lockdown breach warning letter, which is the Northamptonshire Police policy for juveniles for a first breach. If caught further then parents may be subject to fines.