The Russian opposition leader Alexei Navalny was in intensive care in a Siberian hospital on Thursday after he fell ill in what his spokeswoman said was a suspected poisoning.
Navalny, a 44-year-old lawyer and anti-corruption campaigner who is among President Vladimir Putin's fiercest critics, was being treated in a hospital in the city of Omsk after he lost consciousness on a flight to Moscow and his plane made an emergency landing.
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His spokeswoman Kira Yarmysh wrote on Twitter that Navalny had been placed in a coma on a ventilator and that tests were being carried out.
"Alexei has toxic poisoning," she wrote. "Alexei is now in intensive care."
A view shows the City Clinical Emergency Hospital Number 1 where Alexei Navalny was admitted in Omsk, Russia. Reuters
"I'm sure it was intentional poisoning," she told the Echo of Moscow radio station.
State news agency TASS reported that Navalny was in the intensive care unit for toxicology patients in Omsk Emergency Hospital No. 1.
"He is in a serious condition," the hospital's chief doctor Alexander Murakhovsky told TASS.
Yarmysh said police had been called to the hospital at their request.
"We think that Alexei was poisoned with something mixed in his tea. That was the only thing he drank in the morning," she wrote on Twitter.
Russian opposition leader Alexei Navalny speaks to the media in Moscow, Russia. File/AP
The head of the legal department of the Anti-Corruption Foundation that Navalny heads, Vyacheslav Gimadi, wrote on Twitter that "there is no doubt that Navalny was poisoned for his political position and activity."
He said Navalny's lawyers were requesting an investigation into attempted assassination of a public figure.
Navalny has suffered physical attacks in the past.
And he is the latest in a long line of domestic Kremlin critics to suffer an apparent poisoning.
Navalny endured chemical burns to his eye in 2017 when attackers threw green dye used as a disinfectant at his face outside his office.
In August last year Navalny suffered rashes and his face became swollen while he was in a police detention centre serving a short term for calling for illegal protests.
Agence France-Presse