ALSO READEx-KGB spy, daughter seriously ill after 'substance exposure' Ex-Russian spy critically ill in UK 'after exposure to substance' Russian spy poisoning: Police seeking nerve agent source UK counter-terror police probe suspected poisoning of Russian spy, daughter Russia: No information on ex-intelligence officer collapse in UK
The investigation into the attempted murder of former Russian spy Sergei Skripal has widened, as police sealed off the graves of his wife and son and confirmed that a total of 21 people had been treated as a result of the incident.
UK counter-terrorism officers has confirmed that a nerve agent was used in the poisoning and have started investigations to uncover the source.
The use of a nerve toxin, usually only held in state military stockpiles, is being seen as a key indicator of possible Kremlin involvement, the Guardian reported.
On Thursday, the Russian embassy in London sent a tweet, saying of Skripal: "He was actually a British spy, working for MI6."
Moscow has repeatedly denied it has anything to do with the attack
A public inquiry a decade later ruled the Kremlin had ordered the hit.
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