The UK would respond “robustly” to any evidence of Russian involvement in the collapse of former spy Sergei Skripal, Boris Johnson has said.
Mr Skripal, 66, and his daughter Yulia, in her 30s, are critically ill in hospital after being found unconscious in Salisbury, Wiltshire, on Sunday.
The foreign secretary said he was not pointing fingers at this stage, but described Russia as “a malign and disruptive force”.
Russia has denied any involvement.
Mr Skripal – a former Russian agent convicted of spying for Britain – and his daughter were found slumped on a shopping centre bench.
UK police are trying to find out what “unknown substance” harmed the pair.
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Mr Johnson told MPs: “Honourable members will note the echoes of the death of Alexander Litvinenko in 2006.
“And while it would be wrong to prejudge the investigation, I can reassure the House that should evidence emerge that implies state responsibility, then Her Majesty’s Government will respond appropriately and robustly…
“I say to governments around the world that no attempt to take innocent life on UK soil will go unsanctioned or unpunished.”
Mr Johnson said that if it emerged Russia was linked to the incident in Salisbury “it would be very difficult to imagine” that UK representation at this summer’s football World Cup could go ahead in the “normal way”.
He said the UK was “in the lead across the world” in trying to counteract a “host of malign activity” by Russia.
But in a statement quoted by the RIA Novosti news agency, the Russian embassy in London said: “Media reporting could give rise to the impression that this is a planned action by the Russian security services, which in no way corresponds to the truth.”
Police are currently examining CCTV footage, filmed by a Salisbury gym, showing an unidentified man and woman walking near the location where Mr Skripal and his daughter were found.
BBC home affairs correspondent Dominic Casciani said relatives have told BBC news that Ms Skripal was visiting her father on Sunday.
Wiltshire Police has said two officers caught up in the suspected contamination have been treated in hospital for minor symptoms, before they were given the all clear. It is understood their symptoms included itchy eyes and wheezing.
A third member of the emergency services remains in hospital.
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