Officers investigating an alleged rape in Irchester Country Park say "no crime has taken place".
Only July 25, Northamptonshire Police received a report that a 12-year-old girl had been raped in the park on the morning of May 11.
However, a police investigation has now ended, with no criminal offences having been identified.
Det Insp Michelle Douglas, of the Public Protection Unit, said: “We take sexual assault very seriously, and robustly investigate the circumstances of every reported offence.
“A full investigation into this report has been carried out and as a result of our enquiries we are satisfied that no crime has taken place.
“We appreciate the natural concern that this report raised, and I hope our conclusion affords reassurance to the community.”