Gardaí and members of the Armed Response Unit responded to the incident at Renmore Barracks at 10.45 last night.
A man in his 50s received a number of stab wounds and was taken to hospital for treatment of non-life threatening injuries.
It is understood a number of shots were fired by Defence Force personnel
A young man in his teens was restrained by the force and later arrested and is being detained at a Garda station in the west of the country.
The scene is currently being preserved while a technical exam is being carried out.
