The Public Prosecution Service is to appeal a judge's decision to release two men and a woman on bail after an alleged machete and Stanley knife attack on a couple in their Londonderry flat.
The trio, along with a third man, had appeared at Derry Magistrates Court charged with offences linked to the incident at Baltimore House in Bridge Street last Tuesday.
The female occupant of the flat sustained slash wounds to her face and hand.
She had to have facial reconstructive surgery and needed stitches and staples in her hand. Her male partner also sustained slash wounds to a hand.
A police officer told the court the victim's "two fingers were almost severed".
Deputy District Judge Sean O'Hare described the flat as "a scene of carnage".
A detective constable confirmed both victims had so far declined to make complaints.
The officer told Mr O'Hare that all four defendants had been charged with inflicting grievous bodily harm with intent on the two occupants.
The defendants are Conor Lishman (33) from Clarendon Street; Daniel Kelly (33) from Epworth Street; Harry Boyle (29) from The Star Factory in Foyle Road, and Cody Weir (29).
They were also jointly charged with possessing the two blades. The police witness said just after 10am last Tuesday the Ambulance Service reported an incident.
The flat occupants said a masked gang had forced their way into the premises and assaulted them with the weapons.
The officer said the gang then made off in a stolen car, which was spotted by police near Ballykelly.
Officers followed it to Drumahoe on the outskirts of Derry where it crashed and the four defendants were arrested. Inside the vehicle the police found a blood-stained machete.
Boyle, who admitted driving the car, was also charged with dangerous driving, driving without insurance and driving while disqualified.
He d been disqualified three weeks previously.
The Deputy District Judge said because the complainants had not made statements to police, the "case is circumstantial".
He added: "I have no doubt the police arrived at a scene of complete carnage in the flat and when they stopped the defendants they found them to be in the possession of a blood-stained machete which was in the front passenger footwell of the car.
Lishman, Kelly and Weir were all released on conditional bail.
The PPS said later it would appeal against the decision to grant bail.
Boyle was remanded in custody because of the new driving charges.
The case was adjourned until January 28.