Police are investigating a report of a serious sexual assault in Leigh Park Gardens at Havant.
The incident was reported to have taken plae around 4.30pm this afternoon (Sunday 28 May).
A 16-year-old boy from Havant has been arrested in connection with this incident, police said.
He is currently in police custody.
Police said a cordon would remain in place at the park while investigations continued
Anyone with information should call 101, quoting 44170201468.