Germany says independent reviews by laboratories in France and Sweden have confirmed evidence that Kremlin critic Aleksei Navalny was poisoned with a nerve agent from the Novichok group.

“Three laboratories have now independently provided evidence of a nerve agent from the Novichok group as the cause of Mr. Navalny’s poisoning. We renew the call for Russia to explain what has happened.” the German government said in a statement on September 14 in announcing the corroborative findings.

U.S. Secretary of State Mike Pompeo said on September 9 that there is a strong chance the poisoning was ordered by senior officials in Moscow. Navalny’s team, his relatives, and others also believe that Russian authorities are behind the poisoning. The Kremlin has vehemently denied the allegations.