Emergency crews are dealing with a series of explosions at a building fire in Derby.
A number of bangs were heard across the city shortly before 14:00 BST and large plumes of smoke are visible for miles.
Main line train services have been suspended and residents are being advised to stay indoors.
Police said the blaze, at a commercial building in Enterprise Way, is not thought to be suspicious.
Road closures are in place at Prime Park Way, Stores Road to the junction with the Vauxhall garage, and Mansfield Road to the junction with Alfreton road.