U.K. Prime Minister Theresa May said on Monday it was "was highly likely Russia was responsible" for poisoning former spy Sergei Skripal and his daughter in Salisbury eight days ago. Speaking at the House of Commons, May said it has been concluded that the two were were poisoned by "military-grade nerve agent of a type developed by Russia," indicating that either Moscow was responsible for the attack or the country has lost control of its chemical weapons. The prime minister has now given Russia until the end of tomorrow to provide an explanation.