Several residents of Morris County told NJ.com that groups of drones appear after dark and are active late into the night.
Officials have assured residents that there is currently no known threat to public safety.
The area of the drone sightings is in close proximity to the Picatinny Arsenal, a US military facility.
The FBI is requesting help from the public in the form of photos, videos or other information about the drones. You can visit FBI.gov and click "submit a tip."