Large drones have been hovering in formation over northern New Jersey, officials said Monday, leading to "unnerved" residents wondering what's behind these bright, unidentified flying objects appearing almost every night in the sky.

The FBI is investigating the sightings along the Raritan River and is calling on the public for help in gathering information, according to the agency’s Dec. 3 news release shared to X, formerly known as Twitter, by Pix11 reporter Katie Corrado. The roughly 75-mile-long Raritan River is located in central and northern New Jersey.