Three men aged in their twenties and a woman were taken to hospital for treatment following a stabbing at a house in Crumlin in the early hours.
Two of the men remain in hospital – police say one of them is in a critical condition.
Three men have been arrested in connection with the incident.
Detectives investigating the circumstances of the stabbing this morning at Cairn Walk are appealing for witnesses and information.
Detective Inspector Michelle Griffin said police received a call just before 3am.
Police responded along with the Northern Ireland Ambulance Service.
“We have arrested three men in connection with the incident and I want to appeal to anyone who was in the Cairn Walk area at around 2:50am and has information which may assist our investigation to contact detectives by calling the non-emergency number 101, quoting reference number 141 of 27/04/19,” she added.
Alternatively call Crimestoppers charity on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.