The pre-inquest review into the death of Alexander Litvinenko will begin today to decide the parameters for the inquest itself.
It is believed Mr Litvinenko, 43, was poisoned with polonium-210 after having tea with two Russians at a London hotel in 2006, but many questions remain unanswered.
The review will decide how many witnesses there will be, how to disclose the details of Scotland Yard's investigation and whether there will be a website for the public to follow the inquest.
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