Everything we know about the 'mystery drones' spotted over the East Coast
White House National Security Communications Adviser John Kirby said there is no evidence the drones are of foreign origin.
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- Dozens of unidentified aircraft have been spotted over cities in the eastern United States.
- Some of the suspected drones have been seen flying over military bases and airports.
- The FBI says it is still investigating but doesn't believe they pose a threat.
Dozens of unidentified aircraft, at least some of which appear to be drones...
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