Zombie-like monsters capable of killing all in their path have stepped out of Game Of Thrones and onto Belfast's streets.
After slaughtering an army of Wildlings on HBO's Northern Ireland-filmed fantasy drama earlier this week, terrifying White Walkers were rumoured to be prowling round the city yesterday, where they left an icy calling card.
Fountains at Custom House Square appeared frozen solid in an early morning visit from the characters created by George RR Martin.
The sub-zero attraction was cordoned off and a 'police sign' displayed an appeal asking anyone who had witnessed an incident between 2-4am on Wednesday to contact the Night's Watch.
The men of the Night's Watch form the force that guards the border of the Seven Kingdoms.
If Lord Commander Jon Snow does launch an investigation, he might feel at home in Belfast, as he is normally in charge of patrolling a 700ft tall 'peace line'.
The unseasonable spectacle is the latest in a series of clever marketing stunts in a partnership between Tourism Ireland and HBO, who have turned the show's locations across Northern Ireland into must-see destinations for fans. A three-eyed raven has been spotted outside Belfast City Hall, with signs pointing to the Iron Islands and other locations in Westeros - the mythical continent where much of the action takes place.
Elsewhere, visitors to Belfast may have spotted Game Of Thrones-related swords, daggers, and maces in a 'sharp objects bin' at Belfast City Hall, while Targaryen-farmed dragon eggs were on sale in St George's Market.
With filming on the sixth series of Game Of Thrones set to begin next month, Tourism Ireland hopes the installations will continue to attract attention as fans share videos on social media.
Tourism Ireland chief Niall Gibbons said: "We are delighted to continue our partnership with HBO in 2015, to highlight Belfast and Northern Ireland - through the exciting events of Game Of Thrones - on the global stage.
"The campaign is building on the huge success of last year - when our campaign generated almost one million clicks, comments and shares and reached about 100 million fans.
"We are reaching out to the show's global fan base, bringing Northern Ireland to the attention of Game Of Thrones fans worldwide in a fun and innovative way.
"The fans will see our videos and photos, spiking their curiosity about the landscapes and locations featured in the series and inspiring them to come and explore them for themselves."