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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