As usual the media has no clue!
Based on the pictures it looks like the explosion happened inside the house, so it was probably a coal stove in the living area and the explosion was most likely from other sources as suggested. Probably tried to light the stove with road flares and picked up the dynamite instead.
If it was a boiler explosion it seems the floor would have been out on the lawn! Or maybe they reached that magic pyrometric ratio of coal dust to air and boom!
Whatever the case it is certainly no cause for worry, just use common sense and follow manufacturers recommendations when operating your particular coal appliance of choice.