A Mansfield Woodhouse park will be closed for much of the day following a reported assault in the early hours of the morning.
Detectives are trying to piece together what happened in the grounds of the Manor Park Sports Complex, Mansfield Woodhouse, between 1.35am and 4am today (Sunday) after a 21-year-old woman was left shaken and injured.
A cordon will be in place covering the majority of the grounds of the complex while police conduct their enquiries. The leisure centre and changing facilities, however, remain open.
If you witnessed the attack, or saw or heard anything out of the ordinary in the area at that time, call police.
Patrols have been increased in the area to provide reassurance, appeal for information and deter further crime.
If you have any information contact Nottinghamshire Police on 101, quoting incident 176 of Sunday 5 May 2013, or call Crimestoppers anonymously on 0800 555 111.