This 4chan post may have predicted the London terror attack
A user on the forum 4chan shared an image of two guns with a coded reference to the Houses of Parliament.
The user also posted a string of Morse code dots and dashes which translate to a post on text-sharing website Pastebin.
The Pastebin page contains a binary code which – after being translated – points to a GPS location near Big Ben.
Though the post – made on the 'Politically Incorrect' sub-forum – has been archived, it is still visible on the site.
It went live on the afternoon of March 21, almost exactly 24 hours before the sickening terror attack.
One user managed to crack the code and replied: "Big Ben?"
The user also posted a string of Morse code dots and dashes London Terror Attack: LIVE PICTURES Wed, March 22, 2017
Two dead, 12 injured as knifeman mows into crowd in Westminster
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Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster, London
The image of the guns, titled 'lock the code.png', is believed to have been taken from an unrelated post on a different site in 2010.
The 4chan user added an acronym of the sub-forum – /pol/ – on the bottom left-hand corner of the image.
4chan owner Hiroyuki Nishimura said: "I understand the situation. We are ready to respond for law enforcement agency [sic]."
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The binary code points to a GPS location near Big Ben
The attack has left at least four people dead and 20 others injured.
A police officer who was stabbed at the Houses of Parliament and his attacker are among the dead.
Metropolitan Police Head of Counter Terrorism Mark Rowley said: "The officer's family have been made aware."
The attack took place outside the Place of Westminster
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Theresa May was ushered away from Parliament to chair a meeting of the Government's emergency Cobra committee.
A Number 10 spokesman said: "The thoughts of the Prime Minister and the Government are with those killed and injured in this appalling incident, and with their families.
"The Prime Minister is being kept updated and will shortly chair Cobra."