Gardaí and emergency services were alerted following reports of an incident at a house in the Killeens area of Cork City.
A man in his thirties was treated at the scene for apparent stab wounds and was taken by ambulance to Cork University Hospital. His injures are not thought to be life threatening.
A man in his 20s was arrested in connection with the incident and is currently detained for questioning at Mayfield Garda Station where he can be held for up to 24 hours.
The scene is preserved for examination and enquires are ongoing.
