Gordon Brown, former UK prime minister, alleged today in testimony before the Leveson Inquiry that Rupert Murdoch lied under oath. Murdoch told the inquiry last month that Brown had "declared war" on News International during a phone call between the two men shortly after Murdoch's Sun newspaper changed its political allegiance in 2009. Now Brown has said the phone call never happened.

If true, Brown's testimony suggests that Murdoch may have committed perjury, a criminal offence in Britain that could potentially carry a jail sentence.

Following Brown's appearance before the inquiry, a News International spokesperson said: "Rupert Murdoch stands behind his testimony".

Watch Brown's testimony:

Further reading: The Daily Telegraph lists five key points from Brown's testimony.