Problem with the fuse, or, they missed yanking the safety pin, best guesses.
Thanks, af; I had no idea there was that much unexploded ordinance. It’s a miracle more of it doesn’t result in casualties (unless it does, and I just haven’t heard about it).
Thanks, CL; that is very enlightening. So what you’re saying, if I understand it, is that the bomb is unlikely to be a dud. Hmm. Does sitting for so long in the rain and dirt, etc., make it less stable (or is that a question that goes from clueless to worse)?