Local and federal authorities are investigating confirmed reports of mysterious drone sightings in northeastern Colorado and Nebraska that appeared in the night sky this week. Sheriff's offices in Lincoln, Washington and Sedgwick counties have been getting calls this week about the unknown winged devices after initial reports came out of Phillips and Yuma counties, sheriffs said. The drones reportedly have 6-foot wingspans and fly between 7 and 10 p.m. in gridlike patterns 150 to 200 feet in the air in groups of six to 10, the Denver Post reported. Yuma County Sheriff Todd Combs said in a Facebook post Tuesday that the drones are flying in airspace controlled by the federal government, however, the Federal Aviation Administration, the Drug Enforcement Administration, the U.S. Air Force, and the U.S. Army Forces Command said they don't have any information. The Yuma County Sheriff's Office said it doesn't have jurisdiction over that airspace and that shooting a drone out of the sky