A seven-year-old girl has died days after being rescued from a house fire.

A teenage boy has been arrested on suspicion of arson.

The blaze at the terraced house in Darlington was reported at around 1.50pm on Saturday.

A 16-year-old boy was arrested on suspicion of arson but has since been released under investigation, a police spokesman said.

Detective Chief Inspector Traci McNally, from Durham Police, said: “A police investigation is under way.