The Independent reports that senior Newsnight journalist Liz MacKean has warned the Director General of the BBC that the corporation is involved in a "concerted effort" to cover up the decisions which saw an investigation in to Jimmy Savile shelved.
The story due to run on the front page of the paper tomorrow claims that Ms MacKean has tried to speak to George Entwistle about her concerns but that he has failed to respond.
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Teenager TJ Khayatan carried out the prank at the San Francisco Museum of Modern Art - and later posted the results on Twitter.