Officials sound alarm over reports of the strange sights—seen over New Jersey, New York, Maryland and Pennsylvania—with one asking for a “limited state of emergency.”

Federal agencies have said that there is no evidence the drone sightings pose a national security or public safety threat.

Reported drone sightings at night in New Jersey and along the East Coast have sent lawmakers into a panic and spurred demands for an investigation, although federal officials continue to say there is no cause for alarm.