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LONDON — Art prankster Banksy has struck again.

A work by the elusive street artist self-destructed in front of startled auction-goers on Friday, moments after being sold for 1.04 million pounds ($1.4 million). In an Instagram post Saturday, Banksy claimed the dramatic artistic payoff had been years in the making.

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The spray-painted canvas “Girl With Balloon” went under the hammer at Sotheby’s in London, fetching more than three times its pre-sale estimate and equaling a record price for the artist.

Then, as an alarm sounded, it ran through a shredder embedded in the frame, leaving half the canvas hanging from the bottom in strips.

A post on Banksy’s official Instagram account showed the moment — and the shocked reaction of those in the room — with the words “Going, going, gone…”

https://www.instagram.com/p/Bokt2sEhlsu/?hl=en&taken-by=banksy

A video was later posted on the account, stating: “A few years ago I secretly built a shredder into a painting in case it was ever put up for auction.” The video showed images of a shredder being implanted into a picture frame along with footage of Friday’s auction finale.