Attack of the drones: the mystery of disappearing swarms in the US

When groups of sinister drones began hovering over homes in America’s Midwest, the FBI, US Air Force and 16 police forces set up a task force. But the drones vanished. Did they even exist? Amelia Tait investigates

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Who's Behind Those Mystery Drone Swarms? An Investigation

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Attack of the drones: The mystery of disappearing swarms in the US midwest

Some believe that American micro-UAV drone technology will cause havoc with Russia S-400 and S-500 systems. How true is that belief? - Quora

Mysterious drone swarms flying at night are baffling US authorities