A group of computer hackers has tampered with the website of the Sun, owned by News International.
At first, readers were redirected to a hoax story which said Rupert Murdoch had been found dead in his garden.
A group of hackers called Lulz Security, which has previously targeted companies including Sony, said on Twitter it was behind the attack.
Visitors to the Sun website were then redirected to the group's Twitter page, before News International took it down.
News International said it was "aware" of what was happening but made no further comment.
Readers trying to access thesun.co.uk were taken to new-times.co.uk and a story entitled "Media mogul's body discovered".
It suggested that Mr Murdoch had been found after he had "ingested a large quantity of palladium".
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