Inquiry to probe Alexander Litvinenko poisoning death

Two prior attempts to kill ex-Russian spy Alexander Litvinenko may have been made before he died from radiation poisoning in 2006, the BBC has learned.

The one-time officer with the successor to the KGB fled to the UK where he became a fierce critic of the Kremlin and worked for security service MI6.

A public inquiry into the London death of the 43-year-old opens on Tuesday.

Gordon Corera reports.