Sounds like the old "UFO's are swamp gas" and "Roswell was a weather balloon" stories...maybe they're not dealing with breadcrumbs, but battling the entities they let through after accidentally opening up a portal to the wrong world?!?
Steve Quayle talked of such things happening on his Coast-to-Coast interview with George Noory last month
http://www.youtube.com/watch?v=dSImU...F5CF9C&index=0