DENVER (AP)-Authorities have confirmed reports of drone sightings in three more counties in northeast Colorado and at least one Nebraska county after nighttime drone flights in the region caused a national stir earlier this week.
The Denver Post reported Friday that clusters of drones flying at night have remained a mystery to local law enforcement officials and residents seeking to learn the identities of the operators and the purpose of the flights.
Authorities say the drones reportedly have 6-foot wingspans and fly in grid-like patterns in groups of six to 10.
Federal aviation, law enforcement, and military officials say they do not have information about the aircraft.