Highly likely Russia behind spy attack – PM

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Media captionTheresa May: Observe poisoned by “military-grade nerve agent”

Former spy Sergei Skripal and his daughter were poisoned by a military-grade nerve agent of a sort been prepared by Russia, Theresa May has told MPs.

The PM said it was “highly likely” Russia was responsible for the Salisbury attack.

The Foreign Office summon Russia’s ambassador to provide an explanation.

Mrs May said if there is no “credible response” by the end of Tuesday, the UK would finish there has been an “unlawful use of force” by Moscow.

The chemical used in the attack, the PM did, has been identified as one of a group of nerve agents known as Novichok.