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.