My guess is that it will fall in a place that is pretty much empty, and if it is going to fall in a place where there is any possible danger, that place will be evacuated. I don't think there is much to worry about, really. As far as an explosion, I think that it will be loud and make a very large dent wherever it lands, but I don't think there will be an actual bomb-like explosion. I guess we'll see. It doesn't sound like anyone is really worrying about it, so I'm not either.