Two men in their 20's were fatally injured in a single vehicle road collision on the Killala Road in Ballina last night.
The collision occured at about 11.15 pm when a car, carrying three men, collided with a tree near the Costcutter store on the Killala Road.
One man in his late 20's was pronounced dead at the scene.
The other two men - also in their 20's - were taken to Mayo University Hospital where one was later pronounced dead.
The third man remains in a serious condition in hospital.
Gardai say the Killala Road in Ballina is closed to facilitate a forensic examination, and local diversions are in place.
The road will remain closed for much of the day.
Gardai for appealing for anyone who witnessed the collision to contact them in Ballina at 096 - 20560 or the Garda Confidential Line on 1800 666 111.