Russia’s top agency for major crimes says it has opened an investigation into the poisoning in Britain of the daughter of a former Russian double agent and the death of a Russian businessman whose body was found in London this week.

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The Investigative Committee said Friday it was ready to work with British authorities in the cases of Yulia Skripal and Nikolai Glushkov. Skripal and her father Sergei, a British citizen, are in critical condition after being exposed March 4 to what British authorities say was a nerve agent.

Glushkov was found dead Monday and authorities have not stated a cause of death. But the Investigative Committee said it would probe the case as a murder read more.