A leading Russian opposition politician, former deputy Prime Minister Boris Nemtsov, has been shot dead in Moscow, Russian media report. 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, Russian-language news website Meduza reports.
"Several people" had got out of a car and shot him, it added.
