Robert Duffy, 42, of Charlestown, and Jeremy Folcik, 32, of Bridgewater, were arrested Saturday on Long Island in Boston Harbor, police said.

The charges against the two men come amid a growing concern about an increase of unidentified drone sightings around the northeastern United States.

The mystery surrounding at least one of the unexplained drones causing Americans to look toward the night sky in recent days was solved late Saturday evening, when Boston police arrested two men for flying their unmanned aerial device too close to Logan Airport.