The few people willing to talk will tell all that they know. Their 'city' was mostly a loose conglomeration of families, built near a central point, so they cover a lot of space, far more than a typical mortal town. As such, if someone goes missing, it typically won't be noticed for a while, since there's always a chance they were summoned, or simply wandered off to do their own thing for a while. But, with more than a third of the town missing, people are in a near panic. There have been reports of people spotting portals, but they're always gone very quickly; no one has had a clear look at one, and they usually seem to catch beings alone, or in pairs... and those are never seen again. They've started sticking in larger groups, for the most part; none of those have disappeared, as of yet, but there are always rumors. They also haven't seem to have targeted the central part of the town, yet, either, so people have started moving closer together, and abandoning their outlying homes.