A camera used to record the weather 10 miles from Belper caught the moment of explosion. Four seconds into the video, a column of smoke appears in the middle of the picture.
More top news
ITV Border Political Editor Peter MacMahon says it's far too early to call this referendum.
A World War Two veteran has told ITV News he has fulfilled a boyhood dream by voting for an independent Scotland.
Keep on top of the referendum results as they are announced from 32 counting stations across Scotland.