Police want to speak to anyone living near Millbrook Park who saw an alleged fight between a group of teenagers last Saturday night (6 February).
Officers say it happened by the middle pavilion at around 9:30pm, resulting in two boys getting cuts and bruises.
Two 17-year-old boys were arrested for breach of the peace and common assault and have been bailed pending further enquiries.
Police are particularly keen to speak to people living in private properties overlooking the park who may have any information.
Anyone who can help with police enquiries can call 612612 or Crimestoppers anonymously on 0800 555 111.

'Momentous' week in Jersey's States
Plans to charge wealthiest patients for medical travel
Railway Walk reopens 'several weeks' ahead of schedule
New bar opening at former Rojo and X site to evolve Jersey's nightlife
Former Chief Minister seeks re-election
Château Vermont to become home to new music campus
St Saviour break and entry suspect pictured posing on motorbike
'Overstretched' neurology department following under-experienced managers