Eerie footage of a white orb of light flying through the sky has been filmed close to South America's highest monument.
An eyewitness captured the dramatic footage on his phone from the observation windows of the 272-foot Cruz del Tercer Milenio - Third Millennium Cross, in northern Chile.
It appears to show a white ball of light in mid-air flying high over the city which at one point appears to shoot at speed towards the camera in broad daylight.
The clip was later posted on social media and video-sharing platforms where it sparked a lively debate and made national headlines.
Some people were virtually convinced that Chile had been visited by extra-terrestrials while others were equally positive it was just a reflection on the glass of the monument's windows.
One viewer said: "Amazing recording of mysterious light, UFO ", while another added: "Now all the channels are talking about the UFO."
But another said: "It's obviously the flash of the mobile phone," and others agreed: "How ridiculous, it's clearly the mobile phone flash, the man goes closer to the window and the UFO does too."
Chilean ufologist Marco Antonio Gomez, of the Marcc UFO group, called for caution.
He said: "We cannot say that everything we see is a spaceship.
"We see lot of strange things but 99 percent have an explanation - satellites, meteorological phenomenons or human stuff.
"If you see a UFO, stay calm and film it right until the end.
"A lot of videos cut off too soon and that can mean the cause remains unknown."