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Sergei Kovalyov in Hospital After Heart Attack

Moscow, July 8 (RFE/RL) -- News reports say that leading Russian human rights activist Sergei Kovalyov was taken to hospital early this morning after suffering a serious heart attack.

Interfax news agency quoted his aide, Irina Yeryomina, as saying Kovalyov suffered the attack while working late at night on a book and that "his condition is grave."

Kovalyov was rushed to Moscow's Central Clinical Hospital. No further details were immediately available.

Kovalyov, who was once President Boris Yeltsin's senior human rights adviser, broke with Yeltsin over the bloody conflict in Chechnya last January. He is currently a member of the State Duma.

A biologist, Kovalyov joined Andrei Sakharov in 1967 as a human rights activist. Kovalyov spent seven years in prison and three in exile after being arrested in 1974 for anti-Soviet activities.