Two further arrests have been made by police after the death of 17-year-old Callum Riley on Saturday.
A 25-year-old man has been arrested on suspicion of murder and a 23-year-old woman has been arrested on suspicion of assisting an offender.
They remain in police custody alongside two men, aged 18 and 33, who were arrested yesterday.
A 21-year-old woman has been released and faces no further action.
Callum Riley was found with serious injuries on Atholl Drive in the Heywood area of Rochdale and was pronounced dead soon afterwards.
Detective Chief Inspector Gina Brennand, of GMP’s Major Incident Team, said: “Our thoughts remain with Callum’s family, who we are liaising with via a specially trained officer.
“Our investigation is very much ongoing and we are continuing to appeal for information.
“Officers from the Rochdale district will be providing a visible presence in the coming days to reassure members of the public – anyone with concerns can approach them.”
Anyone with information should contact GMP via Public Portal or 0161 856 3400 quoting 723 17/09/22. Information can also be shared via the independent charity - Crimestoppers on 0800 555 111.