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Members of 4chan's /pol/ board, the hotbed of the alt-right, are pretty active in Britain, as the conspiracy theories around Grenfell Tower fire and the terror attack at Ariana Grande concert show.

But this time they have stepped up their game.

Hackers from /pol/ claimed responsibility on 4chan for breaking into a billboard in the heart of Cardiff's busy shopping district and using it to broadcast swastikas, images about Islam, a Big Brother message from George Orwell's 1984 and a photo of Donald Trump as alt-right meme Pepe the Frog.

Members of the channel boasted about the op in several posts, saying they'd be "broadcasting images of your choice" and inviting people to "post memes you want to be on the big screen in the thread".

As you can see, a fake declaration that the area was under Sharia Law ended up on the billboard:

South Wales Police said they received a number of calls related to the incident. "We alerted the city council and will investigate any crimes which may have been committed," a spokesman said.

The council then reached out to BlowUP Media, the company that runs the billboard, and it has since been turned off.

See more here:
Alt-right hackers take over billboard to broadcast swastikas and Trump as Pepe the Frog - Mashable