Det Insp Emma Matts said: “Sadly, following the death of the victim last night, this has now become a murder investigation.
“Officers are continuing to work at speed to establish the details of the attack and we have made a number of arrests as we continue to understand what has happened.
“A scene preservation will remain in place at the park while our investigation progresses. Local officers are also in the area carrying out reassurance patrols and can speak to anyone in the local community who has concerns.”
Officers have said they are particularly keen to speak to anyone who saw the victim before the assault or a group of young people leaving the area.
Follow Leicester on Facebook, external, on X, external, or on Instagram, external. Send your story ideas to [email protected], external or via WhatsApp, external on 0808 100 2210.