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Boris Johnson launched a bizarre rant against Jeremy Corbyn over the Foreign Sceratary's spy poisoning bungle.

The top Tory wrongly claimed Porton Down scientists had pointed the finger at Russia for the Novichok chemical weapon attack which left former Russian spy and double agent Sergei Skripal, his daughter Julia and Detective Sergeant Nick Bailey fighting for life.

And the Foreign Office today deleted a tweet claiming the experts blamed Russia for the nerve agent assault.

The March 22 message said: “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.”

Porton Down experts only identified the nerve agent - and on Tuesday refused to blame the Kremlin, saying it was not their job.

Asked in a German TV interview last month why the UK believed Russia was the source of the nerve agent, Mr Johnson said: “The people from Porton Down, the laboratory, they were absolutely categorical. I asked them that myself.

“I said ‘Are you sure?’. He said ‘There’s no doubt’.”

Mr Corbyn today accused the Foreign Secretary of “exaggeration”.

(Image: PA)

Campaigning in Watford, the Labour leader said: “He claimed categorically - and I think he used the words 101% - that it had come from Russia.

“Porton Down have not said that, they said that they’ve identified it as Novichok, they cannot identify the source of it.

“Either the Foreign Secretary has information that he’s not sharing with Porton Down or it was a bit of exaggeration.”

Mr Johnson hit back on Twitter, saying:

Labour called on Theresa May to order a probe to investigate whether Mr Johnson broke the Minsterial Code.

Shadow Cabinet Office Minister Jon Trickett said: “The Foreign Secretary has some serious questions to answer over whether he misled the public, but is instead trying to deflect criticism with his characteristic bluff and bluster.

“He clearly previously indicated that Porton Down had told him ‘categorically’ that Russia was the source of the nerve agent.

“The Ministerial Code states Ministers must be open with the public and honesty is one of the key standards of Ministerial behaviour.

“The Prime Minster must now launch an investigation to determine whether her Foreign Secretary broke the code.”

Labour tonight called on Theresa May to order a probe to investigate whether Mr Johnson broke the Ministerial Code.

(Image: REUTERS)

Shadow Cabinet Office Minister Jon Trickett said: “The Foreign Secretary has some serious questions to answer over whether he misled the public, but is instead trying to deflect criticism with his characteristic bluff and bluster. He clearly previously indicated that Porton Down had told him ‘categorically’ that Russia was the source of the nerve agent.

“The Ministerial Code states Ministers must be open with the public and honesty is one of the key standards of Ministerial behaviour. The Prime Minster must now launch an investigation to determine whether her Foreign Secretary broke the code.”

Porton Down’s boss Gary Aitkenhead this week said that while his staff could confirm it was Novichok, they were unable to pinpoint the source.

Sources stress the blame was laid on Moscow when other evidence, including secret intelligence, was considered alongside scientific tests.

Diplomats met behind closed doors at The Hague yesterday(WEDS) after Russia called an emergency meeting of the Organisation for the Prohibition of Chemical Weapons.

Moscow’s bid for a fresh joint inquiry flopped as it lost a crunch vote 15-6. Seventeen countries abstained.

It plans to call an emergency UN Security Council meeting today.

OPCW director general Ahmet Üzümcü said results from its tests were “by early next week”.

He added: “Once the results of the analyses of the samples are received, the Secretariat will produce a report on the basis of these results and will transmit a copy of this report to the United Kingdom.”

Speaking at Russia’s Embassy in the Hague, its Ambassador Alexander Shulgin accused Britain of “procedural tricks” and hailed support Moscow secured from “our partners and allies”.

He also hit out at the UK for giving the Kremlin 24 hours last month to prove its innocence over the poisoning.

“As regards politeness, we all remember the ultimatum presented by Theresa May,” said Mr Shulgin.

Meanwhile, Facebook has removed 135 accounts it believes are linked to the Russia-based Internet Research Agency, an organisation accused of spreading divisive messages across the internet, supporting the Russian government and attempting to weaken its rivals.