An investigation into the cause of a fire at a commercial building in Derby has found that it was not started deliberately.
Numerous explosions could be heard and residents were advised tokeep their windows and doors closed.
St Mary's Wharf police station, which is near the commercial building, was among the evacuated buildings. No one was injured in the blasts.
According to East Midlands Ambulance Service, train services between Derby and Chesterfield were cancelled.