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"County and local law enforcement agencies are aware of the recurring reports of drone activity around Morris and Somerset counties, and acknowledge the public’s concern about these repeated sightings," they said.

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"Morris County Sheriff James M. Gannon would like to inform everyone that the recent drone activity observed by many in our communities is being actively investigated. There is no advisable immediate danger to the public at this time," the Morris County Sheriff's Office said in a statement.

Larger than the typical drones used by hobbyists, the devices have raised questions due to their proximity to both a military installation and President-elect Donald Trump's Bedminster golf course, officials said.

Multiple Morris and Somerset County officials said in a joint statement they would continue to monitor the drone activity.

The "cluster of what look to be drones and a possible fixed wing aircraft" have been recently sighted along the Raritan River, the FBI said.