DRONES described as big as cars have been spotted over the Midwestern sky, sparking conspiracy theories and leaving many scratching their heads.

Sightings have been reported in Colorado since November, and in recent weeks they have stretched to Nebraska and Wyoming.

2 People in three different states have reported seeing drones in the night sky

2 This image was taken on January 2 and shows red lights from wind turbines in the same area as many drone sightings have been reported in Colorado Credit: AP:Associated Press

Authorities in Colorado have tried lay the conspiracy theories to rest after using a heat-detecting plane and concluding there was nothing unusual or criminal about the drone reports.

Most of them were written off as hobbyist drones, stars and planets.

However, speculation is running rife across the Midwest as the large-objects are reported to be as big as cars and even flying in grid patterns at night.

Dan Carlson, a drone-spotting retired meteorologist in western Nebraska, said: "Even if the military has plausible deniability with this, defense contractors might be involved.

“By the time they ’fess up to it, they’ll have been in sky for four years.”

Carlson said that he has seen drones fly by his farm at night outside Sidney, Nebraska four times this year already.

He they flew in pairs on two nights and he suspects the US Air Force must know of the unexplained objects after he observed their speed and range.

He said he saw the drones come within a mile or two of his house, flying about 800-feet high and one sped away at 60mph.

Carlson added: "I do not buy into the conspiracy theories. I am not living in fear of an alien invasion."

Carlson followed the drones for more than 10 miles and the others he saw fly over the horizon.

MYSTERY IN THE SKY

He said: "It was the kind of night that if an airplane flies over at 30,000 feet, you hear it. No sound with these."

Carlson believes the drones could be involved in a military search-and-recovery exercise.

F.E. Warren Air Force base in Cheyenne, Wyoming, oversees 150 Minuteman III nuclear missiles in silos and spans across the prairie in the three-state region.

Air Force officials have said the drone reports have nothing to do with them.

Lt. Jon Carkhuff, a base spokesman, said: "Our base is kind of a drone no-fly zone. So we do have counter-UAS — unmanned aerial systems — training that goes on within the confines of this installation.

"But any drones spotted outside this installation are not part of our fleet."

Personnel on the base said they have not seen the reported drones, but said they were cooperating with the Federal Aviation Administration and FBI.

Officials in Colorado did not investigate the reports of sightings in Wyoming or Nebraska.

The Colorado Department of Public Safety said officials received 90 reports of drone activity between November 23 and January 3, and said 14 of those were confirmed to be hobbiyst drones.

The report also said there were 23 drone reports between January 6 and 13, which was found to be "planets, stars or small hobbyist drones".

Six were also ruled out as atmospheric conditions or commercial aircraft, but the last four couldn't be identified, according to officials.

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The Colorado department said it will scale-back flying the heat-detecting plane to try and stand up reports as they are made.

State officials said there are more than 24,000 registered drones in Colorado and pilots reported more than 2,200 done sightings to the FAA in 2018.

Ian Gregor, an FAA spokesman, said: "We take every drone-sighting report seriously. Multiple FAA divisions are continuing to work closely with federal, state and local stakeholders on this issue."

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