Four Doncaster people - including a boy - have been arrested by West Yorkshire Police in connection with the murder of Sidney Cox in Leeds last summer.
Detective Chief Inspector Jon Morgan said: “Three men aged 36, 34 and 16 were arrested on suspicion of murder and a 37-year-old female has been taken into custody on suspicion of conspiracy to commit murder. They all remain in police custody at the present time.”
Mr Cox died the day after being seriously injured in a violent attack at an address on Middleton Lane on Saturday, August 24 last year.
Detectives have already charged five people, some also from Doncaster, with the murder of Mr Cox.