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.
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Yorkshire Water says the tap water in Thorne, near Doncaster, is still not fit to drink after a contamination scare.
In December 2012, gunman Adam Lanza shot dead 20 children and six teachers in the Connecticut school, before turning the gun on himself.
The study, conducted by the European Banking Authority, looked at how much capital would be used up in adverse economic conditions.