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7 November 2012 Last updated at 15:02 ET

A man serving a life sentence for the murder of two French students jumped on one of his prison guards and held a knife to his throat, a court has heard.

Reading Crown Court was told Daniel Sonnex jumped on Richard Stringfellow's back and held a vegetable knife to his throat in June 2010.

The jury heard it happened at HMP Long Lartin, Worcestershire, where Sonnex was serving life for two murders.

Sonnex, 27, denies falsely imprisoning the guard and threatening to kill him.

The court was told how Sonnex, who had converted to Islam, started shouting, foaming at the mouth and chanting in Arabic when he was restrained by other prison officers after the attack on 19 June 2010.

The jury was told that two years earlier - in June 2008 - Sonnex tortured and stabbed to death Laurent Bonomo and Gabriel Ferez.

They were also told he was sentenced to life, with a minimum tariff of 40 years for the double murder.

Sonnex, formerly of Deptford, south-east London, is now being held at high-security psychiatric hospital Broadmoor, the jury also heard.

The court heard that Sonnex admitted jumping on Mr Stringfellow and holding the knife to his throat, but said he never intended to hurt him.

More here:
Students' killer 'attacked guard'