The tweet claimed experts had “made clear” that the nerve agent was made in Russia
The UK Foreign Office has admitted deleting a Twitter post claiming that experts had “made clear” that the nerve agent used in the Salisbury attack was made in Russia.
A Twitter post on the 22nd March claimed that "analysis by world-leading experts at the Defence Science and Technology Laboratory at Porton Down made clear that this was a military-grade novichok nerve agent produced in Russia."
The Tweet noted that the British Government’s Porton Down facility is accredited with international watchdog the Organisation for the Prohibition of Chemical Weapons (OPCW) and a "designated laboratory."
The facility is located just outside of Salisbury.
Although a cached version of the Twitter post is still available on the internet, the original tweet has been deleted.
It comes after the CEO of the UK Defence Science and Technology Laboratory (DSTL) at Porton Down said that while researchers were able to prove that the substance used was novichok – a military-grade nerve agent developed by Russia from the 1970s onward – they could not confirm that it was manufactured in Russia.
He also refused to comment on whether the lab had developed or keeps stocks of novichok - but dismissed suggestions the substance used to poison the Skripals had come from Porton Down.
The comment prompted Russian president Vladimir Putin to call for a joint inquiry into the attack, claiming that the agent could have been made in any of 20 different nations.
Given the lack of precise information about the nerve agent's origin, he also complained about "the speed at which the anti-Russian campaign has been launched," adding that it "causes bewilderment."
British officials have described the request for a joint investigation as "perverse."
The UK Government has consistently blamed Moscow for the Salisbury attack, prompting an increasingly bitter diplomatic rift with the Kremlin.
More than two dozen countries – including Ireland – moved to expel Russian diplomats in solidarty with the UK after the British Prime minister insisted there was “no alternative conclusion other than that the Russian state was culpable” for the attack.
After it emerged on Wednesday that the tweet had been deleted, the Foreign Office said the post was removed because it "did not accurately report" the words of Laurie Bristow, the UK's ambassador to Russia, which the tweet was supposed to be quoting.
However, the Russian government seized on the revelation of the tweet's deletion to restate its claim the Salisbury attack is being used to "vilify" Moscow.
Russia's deputy foreign minister Sergei Ryabkov told the Interfax news agency: "Based on what was expressed before those reports and what is being voiced and published on social networks by official UK representatives after this report, I draw the conclusion that there are no illusions, they had designated the guilty party from the start and they will not give up this policy.
"We will see the further development of this scenario in the near future contrary to logic, contrary to common sense, because totally different tasks are being set and all this case is being played out in order to completely vilify Russia geopolitically; this is an attempt to isolate Russia and so forth rather than to find out what really happened to Sergei Skripal and his daughter."
The Russian embassy in the UK also asked why the Foreign Office post had been removed.
The now-deleted tweet was posted two days after Foreign Secretary Boris Johnson, in an interview with German broadcaster Deutsche Welle, claimed staff at Porton Down were "absolutely categorical" and told him there was "no doubt" the source of the nerve agent was Russia.
The Foreign Office insisted Mr Johnson's comments and what Porton Down have said recently is "fully consistent" with UK Government's position throughout the fallout from the Salisbury attack.
But Labour leader Jeremy Corbyn has warned that Mr Johnson has "serious questions to answer."
He said: "There clearly was a huge inconsistency in that the Foreign Secretary had made a statement, the Foreign Office put out a tweet in support of what he's said.
"Porton Down then said they couldn't and wouldn't identify where it had come from, so they then deleted the tweet.
"Where does that leave the Foreign Secretary? Egg on his face for the statement he made on German television."
Responding to the questions, Mr Johnson accused the Labour leader of "playing Russia's game."
It is lamentable that Jeremy Corbyn is now playing Russia’s game and trying to discredit the UK over Salisbury attack.— Boris Johnson (@BorisJohnson) April 4, 2018
Let’s remember the key facts:
1) Porton Down identified nerve agent as military grade Novichok; 2) Russia has investigated delivering nerve agents,likely for assassination,& as part of this programme has produced and stockpiled small quantities of Novichoks; 3) Russia has motive for targeting Sergei Skripal.— Boris Johnson (@BorisJohnson) April 4, 2018
28 other countries have been so convinced by UK case they have expelled Russians. In contrast, Jeremy Corbyn chooses to side with the Russian spin machine.— Boris Johnson (@BorisJohnson) April 4, 2018
The UK Foreign Office has insisted that a full transcript of Dr Bristow's briefing to international diplomats on 22nd March has been available online since the day it was delivered.
They said the briefing was "tweeted in real time" by the UK embassy's Twitter account and had been "amplified" by the Foreign Office account to "explain what happened in Salisbury to as wide an audience as possible."
A spokesperson said: "One of the tweets was truncated and did not accurately report our Ambassador's words. We have removed this tweet.
"None of this changes the fact that it is our assessment that Russia was responsible for this brazen and reckless act and, as the international community agrees, there is no other plausible explanation.
"No other country has a combination of the capability, the intent, and the motive to carry out such an act."
The questions over the Foreign Office tweet came as discussions of the Salisbury poisoning at an extraordinary meeting of the OPCW further heightened tensions between London and the Kremlin.
Ahmet Uzumcu, the director-general of the OPCW, used the meeting to announce he expects to receive the results of his organisation's own independent analysis of samples from Salisbury by early next week.
Including analysis of biological samples from the Skripals and police officer Nick Bailey, who was also exposed to the nerve agent, the results will then be sent to the UK Government.
Speaking on a visit to Turkey, Russian President Vladimir Putin said he is waiting for the moment when "common sense comes out victorious and international relations stop receiving the damage that we are witnessing right now."
Additional reporting from IRN ...