The description of the "locusts" is quite detailed in The Revelation (9:7- 10). They may be mutant insects, demons (i.e. fallen angels) or even tormented souls trapped inside tiny little machines, as the description of them each having human faces suggests.
For a world that has largely assumed that hell is a fairy tale and that the devil is a joke, this chapter may be a bit hard to swallow... possibly even infuriating.
But consider what it would have sounded like two hundred years ago, if we had talked of cell phones and computer graphics, jets, atomic bombs, and laser images. God's technology is light years ahead of our own, and so there may yet be some big surprises for those of us living in the confines of what little Twenty-First Century science can tell us about life, the universe, and everything.
We personally believe that God acts in accord with his own rules. But we also believe that only God has the complete rule book. And so there may be dimensions that we have not even begun to fathom yet.
Witches, fairies, UFO sightings, and other psychic phenomena are being taken quite seriously by many these days. So why rule out the possibility of angels, devils, curses and divine protection, especially when they come from a source that is as reliable as the Bible?