A 17-year-old boy from Long Eaton and two men from Sandiacre aged 21 and 43 have been held by Derby Police on suspicion of murder.

They are currently being questioned in custody.

Amy Smith, 17, her six-month-old daughter Ruby-Grace Gaunt and friend Edward Green, also 17, died at a property in North Street, Langley Mill, Derbyshire, in the early hours of Sunday.

Two men, aged 18 and 17, who were also inside the premises at the time, were rescued by neighbours and treated for smoke inhalation, police said.

Amy and Ruby-Grace lived in the flat, while Edward was from Belper.

Assistant Chief Constable Martyn Bates said: "The cause of the fire is still unknown and the possibility that it was started deliberately is just one of many lines of inquiry we are pursuing at this time.

"These arrests do not mark the end of the investigation, far from it. I would still urge anyone with information to come forward and speak to us."