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.

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.”

The White House, FBI and Homeland Security said on Thursday they had no evidence that drone sightings reported in New Jersey posed national security or safety threats, despite concerns raised by lawmakers.