At around 7.45pm on Monday 8 June 2020, police were called to reports that a child had been raped near to Balmoral Drive in Heywood, Rochdale.
A 24-year-old man was arrested on suspicion of rape. He has since been bailed pending further enquiries.
Specialist officers are supporting the girl and her family.
Enquiries remain ongoing.
Detective Inspector David Crewe, of GMP’s Rochdale division, said: “This is a horrendous incident and we have specialist officers who are supporting the girl and her family throughout this difficult ordeal.
“Although a man has been arrested and bailed pending further enquiries, police are still actively investigating to uncover the full circumstances surrounding this crime and enquiries remain ongoing.
“If anyone has any information at all that could help police with their investigation, please do not hesitate to get in touch as soon as possible.”
Anyone with information should call police on 0161 856 4668 or 101 quoting incident number 2536 of 09/06/2020, or the independent charity Crimestoppers, anonymously, on 0800 555 111.