Unidentified drones have been spotted flying over sensitive US military installations and have perplexed US military officials about their origin and purpose.
The drone activity lasted more than two weeks and typically began about an hour after sunset. The drones appeared to be approximately 20 feet long and flew at speeds exceeding 100 miles per hour at altitudes ranging from 3,000 to 4,000 feet.
This ongoing investigation highlights the challenges of maintaining security in an era of growing drone innovation and use.
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