Three people, including a teenage boy, are in serious condition in hospital in the North today following separate incidents at parties last night.
PNSI officers were called to a party in Aspen Park in Dunmurry, Co Antrim
at around 4.30am, where they discovered an injured boy in his mid-teens. He is understood to have been stabbed in the head.
Four people were arrested at the scene.
The victim was taken to hospital where his condition is said to be serious but not life-threatening.
Another man was stabbed in north Belfast. A PSNI spokesman said the man was attacked at a party in Torrens Drive at around 2.00am. He is also in a serious condition in hospital.
Police are searching for a man who fled the scene on foot. He was said to be wearing a duffel jacket and a black scarf.
In a separate incident in north Belfast, police were called to a house in the Greymount Crescent area at around 6.30am following reports of an assault.
A man was found injured at the scene. He had suffered serious but not life threatening injuries. There were no arrests.
Police in north Belfast also had to separate two gangs of people during disturbances in the early hours of the morning.
At around 4.45am, the rival groups assaulted each other with clubs, bricks and bottles in Merston Gardens, off the Serpentine Road. CS spray was used to help separate the groups.