Berlin police told Reuters an ‘investigation has been opened’ after German newspaper Welt am Sonntag, citing Russian investigative journalism site Igentsva, said two women reported symptoms indicating possible poisoning .
Police did not provide further details and said investigations were ongoing.
Media reported that one of them worked as a journalist and that her symptoms may have already appeared before the conference, which was held on April 29 and 30, and that she had gone to the Charité hospital in Berlin.
The second, Natalia Arno, heads the Free Russia Foundation, a non-governmental organization, and wrote on her Facebook page that she discovered that her hotel room door had been left ajar.
She added: “I woke up at five in the morning with severe pain and strange symptoms.”
Western reports speak of attacks on opponents of the Kremlin with toxic substances inside and outside Russia in recent years.
Russian opposition leader Alexei Navalny was treated in Russia and then in Germany in what Western lab analyzes show was an attempt to poison him with nerve gas in Siberia in 2020.
The Moscow government denies the charges.
Navalny voluntarily returned from Germany to Russia in 2021, was arrested in January of the same year and has been imprisoned ever since.
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