(BBC News) A leading Russian opposition politician, former deputy Prime Minister Boris Nemtsov, has been shot dead in Moscow, Russian officials say.
An unidentified attacker shot Mr Nemtsov four times in central Moscow, a source in the law enforcement bodies told Russia's Interfax news agency.
He was shot near the Kremlin while walking with a woman, according to Russian-language news website Meduza.
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"Several people" had got out of a car and shot him, it added.