Mysterious swarms of giant drones have dotted the Colorado and Nebraska night sky since last week, The Denver Post first reported.
The drones appear and disappear at roughly the same time each night in swarms of at least 17 and up to 30. The drones appear to measure about 6 feet across.
Local and federal government authorities say they have no idea where the drones are coming from. They do not appear to be malicious, however, and a drone expert says they appear to be searching or mapping out the area.