According to the Russian embassy in U.K. Russian investigators are in London to investigate the radioactive poisoning death of former Russian agent Alexander Litvinenko, AFP reported March 28.

The three-member delegation headed by Alexander Zvyagintsev, Russia’s deputy prosecutor general, arrived Monday to discuss “some questions of cooperation,” an embassy spokeswoman said adding they will leave Thursday.

She said the delegation would meet London’s Metropolitan Police, which is leading the British probe into the events that led up to Litvinenko’s death in a London hospital on November 23.

Litvinenko was found to have high levels of the radioactive isotope polonium 210 in his body when he died. His associates have accused Russia of poisoning him because of his opposition to President Vladimir Putin.

British detectives are said to have faced a number of restrictions when they traveled to Moscow to question witnesses in the case last year.

The Metropolitan Police said would not confirm that the delegation had arrived.

“An invitation has been extended to Russian investigators to visit the UK in connection with the investigation into the death of Alexander Litvinenko,” a police spokesman said.

“They were invited following a meeting to discuss a request for mutual legal assistance between the Russian authorities and the Metropolitan police service on February 20. The invitation was accepted,” he said without elaborating.

In January, British police submitted a file of evidence on the Litvinenko case to prosecutors for them to consider whether any criminal charges should be brought.

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