A woman who was arrested on suspicion of arson after a fire at Nottingham train station, has been released under investigation.
The fire began just before rush hour on 12th January 2018, spreading to the main concourse and the roof. It is believed to have started in a toilet block.
Trains from the station were cancelled for the remainder of the day.
British Transport Police said a 33-year-old woman was detained in Derby on suspicion of arson and later released under investigation while enquiries continue.
Detective Inspector Granville Sellers said officers would particularly like to speak to anyone who was at the station between 5am and 6.30am on, who may have seen something or somebody which caught their attention.