UFO hunters have been analysing a trio of intriguing videos showing strange sightings over Denver, Colorado with one prominent conspiracy theorist bizarrely claiming the clips are “100 percent proof of aliens”.

Amateur video footage reportedly shot on Sunday, January 31, has emerged online which appears to show a trio of strange white objects seemingly flying in formation. The anomalies are easily visible against a brilliant blue sky due to each of their clearly-defined contrails. The bizarre sight was captured in three independently-captured clips, which all show the incredible object in the sky.

Once posted on social media, the initially Unidentified Flying Objects (UFOs) generated outrageous explanations, including claims they were alien in origin.

Eyewitness Nick Morgan tweeted: “Anybody else see these three contrails over Denver yesterday?

“We were struggling to figure out what they were – Air Force 1 with escort? Incoming missiles? Meteorites?”

He told Express.co.uk: “Those objects are just contrails from three military aircrafts, two of them identified by Mick West of Metabunk as C-17A Globemasters.”