Home Secretary Theresa May announced that a public inquiry will be held into the death of the former Russian spy Alexander Litvinenko.
May said: "I very much hope that this inquiry will be of some comfort to his widow."
Litvinenko, 43, died after drinking tea that was poisoned with the radioactive substance polonium-210.
His widow, Marina is expected to speak later today.
More top news
Friends and family have mount appeals on social media for news of people missing after an Ariana Grande concert hit by a fatal explosion.
The best of the sunshine through today will be across many central and eastern areas.
Here's everything we know so far about the Manchester Arena explosion.