Police officers walk with their sniffing dog checking the area prior a march in memory of opposition leader Boris Nemtsov, who was gunned down on Friday, Feb. 27, 2015 near the Kremlin, in Moscow, Russia, Sunday, March 1, 2015. Russian investigators, politicians and political commentators on state television on Saturday covered much ground in looking for the reason Nemtsov was gunned down in the heart of Moscow, but they sidestepped one possibility, that he was murdered for his relentless opposition to Putin. (AP Photo/Pavel Golovkin) (The Associated Press)
MOSCOW – Thousands are expected to march through central Moscow to mourn veteran liberal politician Boris Nemtsov, whose killing has shaken Russia's beleaguered opposition.
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