A 21-year old man has been stabbed following a disturbance at a flat in Muirhouse in the early hours of Saturday.
Police were called to Fidra Court at around 04:30 and found the man with serious injuries.
He was taken to Edinburgh Royal Infirmary.
A spokesperson for Lothian & Borders Police said they are following a positive line of inquiry but are still keen to speak to anyone with information who was in the area at the time.
If you have information you can call the Police on 0131 311 3131.