Derbyshire Fire and Rescue received a number of calls around 3.30pm today after reports of an explosion at a disused Thornton's factory in Belper.
People were reported to be inside the building at the time of the explosion but everyone is accounted for.
Fire crews are now damping down and the fire is under control.
More top news
It may be Shrove Tuesday, and spring is on the way, but it actually snowed this morning in parts of Staffordshire.
The two sons of Scott Chalkley, who lost his life in the Tunisia attack, said he was ready to start a new life with his partner Sue Davey.
Chilly and unsettled with some sunny spells.