Residents of Ocala, Florida are observing large numbers of helicopters seemingly accompanying unknown planes, but neither civil nor military authorities can identify the aircraft, which have been seen a number of times on recent nights. This is reminiscent of the 'ghost planes' phenomenon that haunted Norway in the 1930s, and of the 1980 Cash-Landrum case near Houston, where a large number of military helicopters were seen accompanying a flaming triangle device. Witnesses to that event received catastrophic radiation doses. A search party in the Norwegian case was sent looking for the ghost planes and never returned.
Let's hope the Ocala case remains benign.
(The photo on the linked page is a stock photo. It's not intended to be a photo of the mystery aircraft.)