« More than 600 reptiles found as animal trafficking group dismantled: Europol | Main | Meghan Markle makes public appearance with Queen Elizabeth on Commonwealth Day »

British prime minister: 'Highly likely' Russia behind spy poisoning

Dan Kitwood/Getty Images(LONDON) -- British Prime Minister Theresa May told members of the Parliament today that it was "highly likely" Russia was responsible for poisoning Russian ex-spy Sergei Skripal and his daughter in England earlier this month.

She said Skripal, 66, and his daughter Yulia, 33, were exposed to a "military-grade nerve agent of a type developed by Russia." They were found slumped over in Salisbury, England, last week, and remained in critical condition.

May told members of Parliament that British authorities had concluded the Skripals were exposed to an agent that was part of the "Novichok" group of nerve agents developed by Russia.

Because Russia had produced the agent in the past and "would still be capable of doing so," it had sponsored assassinations before, and it saw some defectors as legitimate targets, the British government had "concluded that it is highly likely that Russia was responsible for the act against Sergei and Yulia Skripal," May said.

"Either this was a direct act by the Russian state against our country," May added, "or the Russian government lost control of its potentially catastrophically damaging nerve agent and allowed it to get into the hands of others."

The British foreign secretary has summoned the Russian ambassador to the United Kingdom to the British foreign ministry "and asked him to explain which of these two possibilities it is," May said. The foreign secretary, Boris Johnson, has requested a response by the end of Tuesday.

"Should there be no credible response, we will conclude that this action amounts to an unlawful use of force by the Russian State against the United Kingdom," May said.

May laid out a history of what she called "Russian state aggression" -- from annexing the territory of Crimea from Ukraine to a recent speech by Russian President Vladimir Putin where he unveiled weapons systems.

"This attempted murder using a weapons-grade nerve agent in a British town was not just a crime against the Skripals," May said. "It was an indiscriminate and reckless act against the United Kingdom, putting the lives of innocent civilians at risk. And we will not tolerate such a brazen attempt to murder innocent civilians on our soil."

A spokesman for Russia’s foreign ministry, Maria Zakharova, called May’s accusation a “circus show in the British Parliament,” according to Russian news agency Interfax.

“The conclusion is obvious: another information and political campaign based on provocation,” Zakharova told reporters, Interfax reported.

Skripal was a retired Russian double agent living in the U.K., convicted in Russia in 2006 for spying for Great Britain and released in 2010 as part of a prisoner swap.

This is a developing story. Please check back for updates.

Copyright © 2018, ABC Radio. All rights reserved.

ABC News Radio