Novichok poisoning: Intelligence services probed 'unusual' activity at Russian embassy in London

British intelligence services investigated "increased" and "unusual" activity at the Russian embassy in London in the days before and after the Novichok poisoning, the Press Association understands.

MI5, MI6 and GCHQ looked into "frantic comings and goings" at the building in Kensington in the days leading up to the moment former Russian spy Sergei Skripal and his daughter Yulia came into contact with the nerve agent and after they were found unconscious, according to a source.