Alexander Litvinenko's wife appears at death inquiry

The public inquiry into the death of former KGB spy Alexander Litvinenko has heard evidence from his wife Marina.

Mr Litvinenko died in 2006 in a London hospital after he was poisoned with radioactive polonium.

He had fled from Russia to the UK, where he became a vocal critic of the Kremlin and worked for the UK intelligence service MI6.

Gordon Corera reports.