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The sightings, they said, were actually a combination of lawful drones from hobbyists and law enforcement, as well as planes, helicopters and "stars mistakenly reported as drones".

He’d hand out business cards at hobbyist gatherings with promises of adventure, but in practice, he was mostly leading seminars in city parks for beer money.

The “drone” sightings, they say, are of commercial or U.S. military aircraft, helicopters, and perhaps drone flights by hobbyists wanting to get in on the fun.

"The sightings to date include a combination of lawful commercial drones, hobbyist drones, and law enforcement drones, as well as manned fixed-wing aircraft, helicopters, and stars mistakenly reported as drones," they wrote.

They agreed with Biden that many drones that had been sighted were lawfully flown by hobbyists and law enforcement - adding that people were also spotting "manned fixed-wing aircraft, helicopters, and stars mistakenly reported as drones".