Two more teenagers have been arrested after a boy, 17, was stabbed at a party in a Nottingham flat.
The victim remains in hospital with serious, but not life-threatening, injuries.
Emergency services were called shortly before midnight on Friday to an address in Hounds Gate, Nottinghamshire Police said.
Seven teenagers have now been arrested in connection with the incident.
A 17-year-old boy and a 16-year-old girl, who were previously thought to have been injured, were interviewed by officers and have now been arrested on suspicion of affray, the force said.
The boy remains in custody, while the girl has been released on bail.
On Saturday, an 18-year-old man and four boys, all aged 17, who were arrested on suspicion of the same offence – they too have now been released on conditional bail.
Superintendent Kathryn Craner said: “Thank you to those that have come forward and spoken with us to assist our inquiries.
“We now know that a number of those involved are believed to be known to each other and we continue to work around the clock to establish the circumstances which resulted in the shocking acts of violence.
“It is still believed that this incident is not in any way linked to those that took place in the city earlier this week, however we will maintain a high presence in the city centre with additional patrols continuing over the coming days.”