Four men have been attacked in north Belfast, leaving one of them is in a critical condition in hospital.
The attack happened on the Antrim Road at about 4.50am this morning.
The critically injured man is 24 years old.
Two men, aged 31 and 23, have been arrested.
The Antrim Road has been closed between Willowbank Gardens and Hopefield Avenue, as police carry out investigations.
Police have asked that anyone with any information about this incident to contact them in CID in Antrim Road Police Station on 08456008000.