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 and Morris County Sheriff's Department are actively investigating the aerial phenomenon, which has been an annoyance but not yet any kind of safety threat, authorities said. Morris County resident Julie Shavalier said the mysterious night shows have been keeping her up. "We're all completely unnerved," Shavalier told NBC News on Tuesday. "We are working with our state and local partners on the reported drone activity," an FBI representative said.

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