US officials have stressed that the strange drone sightings above New Jersey in recent weeks don't appear to be the work of a foreign adversary.

November, large drones of uncertain origin have been repeatedly spotted in the sky at night over central and northern New Jersey.

Unexplained drone activity over New Jersey, including near military installations, has sparked public concern and calls for federal action. Since mid-November, drones of unknown origin have been reported in central and northern New Jersey.