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.

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

Mysterious drone sightings in New Jersey, New York, Pennsylvania and other East Coast states have prompted an outcry from officials seeking answers about the flying objects, some of which have been spotted near military installations.