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.

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.

The public frustration over the lack of answers hit a peak on Wednesday when US Rep. Jeff Van Drew (R, NJ) claimed “highly reliable” sources told him the drones could be coming from an Iranian mothership stationed offshore — a claim the Pentagon quickly denied, without offering any fruther insight.