An investigation is due to start today into a blaze at an industrial estate in north Derbyshire.
Firefighters were called to Station Lane Industrial Estate, in Old Whittington, Chesterfield at around 3am this morning.
They found a building, measuring 50 metres by 50 metres, well alight.
Crews from Staveley, Chesterfield and Dronfield stations all attended and spent several hours extinguishing the fire.
Some firefighters are still present at the scene damping down the building.
A Derbyshire Fire and Rescue spokesman said: "A fire investigation will be carried out today."