The mystery monolith that sprung up in a desert has disappeared days after it was discovered.
It has been mysteriously removed after appearing in the US state of Utah.
The 10-12ft (3m) metal structure was planted in the ground and tucked into a red rock cove, sparking speculation about how it had come to be there.
But the Utah Bureau of Land Management (BLM) said the monolith has now been removed, and there is mystery surrounding what has happened to it.
The bureau said on Facebook: "We have received credible reports that the illegally installed structure, referred to as the 'monolith' has been removed from the Bureau of Land Management (BLM) public lands by an unknown party.
"The BLM did not remove the structure, which is considered private property.
"We do not investigate crimes involving private property, which are handled by the local sheriff's office.
"The structure has received international and national attention and we received reports that a person or group removed it on the evening of November 27."
It appears there is as much mystery surrounding what has happened to monolith as to how it got there in the first place.
The shiny metal structure was spotted by a helicopter pilot and speculation was rife about what it was.
Pilot Bret Hutchings said: "That's been about the strangest thing that I've come across out there in all my years of flying.
"We were kind of joking around that one of us suddenly disappears, then the rest of us make a run for it.
"We were thinking is this something NASA stuck up there or something. Are they bouncing satellites off it or something?"
It has been compared to technology portrayed in Stanley Kubrick's classic film 2001: A Space Odyssey, while others have likened it to the work of dead artist John McCracken.