The horseracing world has been mourning the deaths of two leading young apprentice jockeys, Jamie Kyne, from Claregalway, Co Galway and Jan Wilson, from Forfar in Scotland.
Mr Kyne's family who run Kiltrogue Stud farm in Claregalway, Co Galway, said they were devastated and in shock.
The 18-year-old had over the past year emerged as one of the most talented and successful apprentice jockeys on the English racing scene.
He had won 29 races during the current season and was being tipped as a potential winner of the Apprentice Jockey of the year award.
He is one of a family of six and had gone to work in England about 18 months ago.
His parents Gerry and Madeline were last night being comforted by relatives who say they are devastated by the news.
The mother of jockey Jan Wilson, aged 19, said she is waiting for official confirmation that her daughter was the other victim.
Police say they will not be naming the victims until they have been formally identified and family members have been notified.
20-year-old apprentice jockey Ian Brennan from Donaghmede, Co Dublin, jumped to safety from the third floor of the building. He was admitted to hospital but has since been discharged.
The fire broke out at a block of flats in Norton near Malton in North Yorkshire in the early hours of yesterday morning.
A local man in his 30s is being questioned by police who are investigating the cause of the fire.
Flags flew at half mast at Dundalk and at York races today as a mark of respect.
A period of silence was also observed before this afternoon's main feature race at York.