Horse trainer Aidan O'Brien and his family have escaped injury following a fire at their home at Ballydoyle in Co Tipperary.
The blaze broke out at around 10pm last night and was confined to an upstairs area of the house. Several units of the fire service attended the scene.
A forensic examination to establish the cause of the blaze is due to be carried out later today.
Ballydoyle is home to Coolmore stud, the largest breeding operation of thoroughbred racehorses in the world.
Gardaí say they are not treating the fire as suspicious.