'Nothing nefarious': Biden seeks to reassure US over drone mystery

A puzzling flurry of apparent drone sightings along the US east coast is "nothing nefarious", says President Joe Biden.

The sightings in recent weeks have occurred in New Jersey and a number of neighbouring states, sometimes around air bases. The phenomenon has prompted a number of conspiracy theories about foreign involvement.

Authorities have not given many definitive answers, other than to say the sightings are not always of drones, and that they do not believe there is a threat to national security or that a foreign power is at work.

Members of the US House Intelligence Committee, who were given a closed-door briefing on Tuesday, joined Biden on Wednesday in trying to reassure the public.

Among the committee members who spoke to reporters afterwards were Chrissy Houlahan, a Democrat.

"To date, they haven't found anything that would indicate that there's foreign influence, foreign actors, or even little green men who are working on the American people," she was quoted as saying by The Hill.

Another lawmaker, Connecticut Representative Jim Himes, said "there is zero evidence of laws being broken" by the drones.

He added that the "vast majority" of sightings were normal aircraft or drones being operated lawfully.

Himes said that "millions" of unregistered drones were operating across the US, in addition to 800,000 registered drones that weigh more than half a pound.

In his own comments to the media, Biden said: "We're following this closely, but so far, no sense of danger."

He stressed that the sightings were not evidence of any wrongdoing. "There's a lot of drones authorised up there," he said. "I think one started it and they all - everybody wanted to get in the deal."