It's the latest internet sensation - amateur footage of three red lights in a triangular formation hovering in the night sky above the town of Lafayette in Colorado.
The video, shot last Monday, shows that the sky was clear and witnesses said they could not see anything connecting the lights.
Leroy Vandervegt, a 50-year-old who has lived in Lafayette for 16 years, shot the video Sunday evening after his 17-year-old son saw the glowing orbs move from south west to south east along the horizon.
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'I had no idea what it is,' he said. 'It wasn't a satellite, it wasn't an airplane and it wasn't a helicopter.'
By Friday, five days after posting, more than 39,000 people had watched the video on YouTube, dailycamera.com reports.
Mr Vandervegt said the lights made no noise and did not blink.
The lights remained in a triangular shape as they moved forward, though the shape of the triangle changed.
Denver International Airport officials would not talk about the sighting but, intriguingly, Allen Kenitzer, the Federal Aviation Administration's spokesman for the Rocky Mountain region, said his staff didn't see anything out of the ordinary.
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Strangely people subject to regular drug testing did not see anything out of the ordinary ...