A 12-year-old boy is among six people arrested after a man was beaten unconscious with metal bars and left with "potentially fatal" injuries.
Several attackers bludgeoned the 29-year-old victim on Chinley Avenue in Moston, Manchester, police said.
He is in a critical condition in hospital after being found in the street with a serious head injury on Saturday night.
The 12-year-old was detained along with two boys aged 14, one aged 15 and one aged 17. A 32-year-old man was also arrested.
Detective chief inspector Andrew Cunliffe said: "This is a serious attack which has left a man with potentially fatal or life-changing injuries.
"We know that an incident occurred on nearby Bluestone Road and this has continued on to Chinley Avenue, where the attack itself took place.
"We now have people in custody in relation to this assault, but that should not prevent witnesses coming forward and telling us what they saw."
Anyone with information can call 101 quoting incident number 150417/2054, or Crimestoppers anonymously on 0800 555 111.