LONDON — Art prankster Banksy has struck again.

A work by the elusive street artist self-destructed in front of startled auction-goers Friday, moments after being sold for $1.4 million.

In an Instagram post on Saturday, Banksy claimed the dramatic artistic payoff had been years in the making.

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…”

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.

Sotheby’s – which had noted before the sale that the work’s ornate gilded frame was “an integral element of the artwork chosen by Banksy himself” – appeared as shocked as anyone else.

– From news service reports