The Video at comment #27 showed massive explosion lighting up the night sky from 10 and 20 miles distance. You could hear the roar of burning fuel in both clips. So far no radiation reported. Probably load these shells elsewhere. More info tomorrow when US satellite photos can get a clear look at this site surrounded by housing.
Two men discussing possible causes ranged from accidental explosion, poor safety and maintenance, sabotage, or Ukraine. Poor safety and management was judged the most probably cause. Could vodka have been involved? Had they recently had to send some of their best workers to fight in Ukraine and use new undertrained ones?
So does the engine work or not?