Drones by the dozens have been reported flying in recent weeks over Long Island, with thousands more observed in other parts of New York and New Jersey. The sightings have prompted an FBI investigation as well as other efforts aimed at finding out who is operating the drones, why and whether the airborne devices are a safety risk.

Reports of unmanned aircraft have come from a handful of East Coast states. And while federal officials say there’s no cause for concern, demands for answers are growing.