Officials from the Irish Embassy in London are trying to establish if an Irish citizen was among those killed in a fire in North Yorkshire.
Two apprentice jockeys died in the fire at a block of flats, near Malton, which started in the early hours of Saturday morning.
Formal identification of the victims has not yet been made.
The Department of Foreign Affairs said officials from the embassy are in contact with the North Yorkshire police.
A man has been arrested on suspicion of arson attack.