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A man in his 30s arrested on suspicion of rape has been released on bail.
Surrey Police said they were called at 16:50 BST on Monday following a report of concern for a woman's safety at Horley Recreation Ground.
Officers said they were supporting the woman following the incident.
Police have appealed for anyone who was in or around the recreation ground between 16:30 and 16:50 BST on 26 May and saw "anything suspicious" to get in contact.