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The video obtained by investigate journalist David Collins shows military aircraft in the skies above Arizona on the night of one of the world's most famous UFO sightings in March 1997

 This incredible leaked classified video shows fighter jets "engaging unknown aircraft" in the skies above the southern US on the night of one of the world's most famous UFO sightings.
The 14-second clip, posted on YouTube, shows American military aircraft on patrol during the Phoenix Lights sighting of March 13, 1997 when a series of lights were spotted above Arizona's state capital.
The military footage was obtained exclusively by US investigative journalist David Collins, of Phoenix-based KWBV Investigations, who later alerted Mirror Online.
The Phoenix Lights were seen by thousands of Arizona residents but 17 years on what exactly happened remains a mystery.
The US military's official explanation claimed the lights were flares from their aircraft.
READ MORE:http://www.mirror.co.uk/news/weird-news/phoenix-lights-ufo-watch-incredible-4804782