Apparently someone left a lighter in their pocket and all of That is from the gas released when the lighter ruptured
So there’s slightly more to it than that, that dryer is a natural gas dryer rather than a purely electric one. So when the lighter went off (the initial small explosion) it damaged the sealed drum enough to get to the gas lines in the heating element of the dryer which then allowed the natural gas and oxygen to mix, hit the fire from the lighter, and result in the second MUCH LARGER blast.
This is one of the many reasons why you always check your pockets, and also why I’ve never owned a natural gas dryer, even though they’re way more energy efficient than an electric one.
