Forensic experts are carrying out a detailed examination of the flats where two teenage jockeys died in an apparent arson attack.
Jamie Kyne, 18, and Jan Wilson, 19, perished in the fire that ripped through a three-storey block in Norton, near Malton, North Yorkshire, during the early hours of Saturday.
Leading members of the horseracing world have spoken of their sadness at the deaths of the two jockeys.
Police said scenes of crime officers and fire investigators were delayed in entering the block of flats because the blaze was so bad it had damaged the structure of the building. Their work in establishing the exact cause of the fire could take up to three days to complete. Further searching of the flats was taking place to ensure there were no further casualties, although there were no reports of anyone missing.
Police have not yet confirmed the identities of the two victims, but said two bodies had been removed from the second floor of the property. Post-mortem examinations are yet to be carried out. A local man, in his 30s, who was arrested shortly after the fire broke out, was released by police on conditional bail pending further inquiries.
Eyewitnesses said Mr Kyne, from Ireland, and fellow apprentice Miss Wilson, from Forfar in Scotland, were at a party when the fire broke out at Buckrose Court. Their friend and fellow apprentice, Ian Brennan, was also in the third-floor flat and jumped to safety when the fire ripped through the building at 2.15am. The 20-year-old was released from hospital. A fourth person in the block, Irish apprentice jockey Dean Pratt, was also taken to York District Hospital and treated for burns and smoke inhalation.
According to residents, about four or five people from the fire-affected block had been out on Friday night to celebrate getting their "pool money" from one of the local racehorse trainers.
He said they came back to the flats and continued to celebrate on the top floor, where best friends Mr Kyne and Mr Brennan lived. There were six people in the block at the time - Mr Kyne, Miss Wilson, Mr Brennan, Mr Pratt, another man and another woman.
