Greater Manchester Police were called to Clowes Park at around 7.30am on Sunday after receiving a report of an "unresponsive male".

Emergency services attended and the youngster was pronounced dead at the scene.

A 17-year-old boy was arrested on suspicion of murder and has since been released on bail.

Detective Chief Inspector Gareth Davies said: "Our thoughts go out to Alan's family at this incredibly difficult time.

"We ask that they are given privacy at this time to allow them to grieve and come to terms with this devastating incident.

"GMP is continuing its investigation at pace into the circumstances surrounding Alan's death."

Anyone with information has been urged to contact police online or the independent charity Crimestoppers on 0800 555 111.