The wife of Russian ex-spy Alexander Litvinenko has said she is "very pleased" over the decision to hold a public inquiry into his death.
Speaking to reporters, Marina Litvinenko said it still may take a "long time" to get the truth.
Mystery has surrounded the death of the KGB officer, after he died drinking tea laced with radioactive polonium-210 at a London hotel in 2006.
Earlier today, Home Secretary Theresa May announced the inquiry into his death in a written ministerial statement, saying: "I very much hope that this inquiry will be of some comfort to his widow."
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Some 66 people have been killed after the plane they were travelling on crashed in southern Iran.
The letter calls for an end to harassment, abuse, and impunity in a world "ripe for change".
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.