(CNN) A member of Russian feminist punk band and activist group Pussy Riot has been hospitalized in Moscow, according to band members, who suspect he has been poisoned.

Pyotr Verzilov is in the intensive care unit at a Moscow hospital, according to tweets from the protest group's verified account, along with state media reporting.

"His life is in danger. We think that he was poisoned," the account tweeted. The band's outspoken members -- known for obscuring their identities with colorful balaclava-style masks -- frequently protest the Putin government.

Our friend, brother, comrade Petr Verzilov is in reanimation. His life is in danger. We think that he was poisoned. https://t.co/BYVl4rir1a — 𝖕𝖚𝖘𝖘𝖞 𝖗𝖎𝖔𝖙 (@pussyrrriot) September 12, 2018

Russia state news agency Tass quoted Maria Alyokhina, another Pussy Riot member, saying Verzilov was in the toxicology unit and that his relatives had been told they could see him in the morning.

CNN has not independently verified the claims.

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