“What are you fucking playing at?” Those were reportedly the opening words from Rupert Murdoch’s son James Murdoch to The Independent editor in chief Simon Kelner.

The young chairman and CEO of News Corporation Europe and Asia stormed into the rival newspaper’s newsroom yesterday after the UK paper printed a series of promotional ads telling readers: “Rupert Murdoch won’t decide this election. You will.”

The FT reports that Murdoch arrived with a small entourage behind him, including Rebekah Brooks, CEO of News International. She publishes News Corp’s The Times and The Sun. A copy of the newly redesigned Independent was in Murdoch’s hands.