Banksy has posted an anonymous message online attacking the London exhibition due to showcase his work.
The collection of work, which was removed from walls across the country, went on display in the 'Stealing Banksy' exhibition at a London hotel today.
The street artist claimed the show had been organised "without the involvement or consent of the artist" in a message posted on Banksy.co.uk.
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The incident happened at Junction 27 with the M11 in Essex.
The performer was attacked as she went to the aid of an elderly woman.