Tens of thousands of people joined a march in the heart of Moscow organized by Russia's opposition in memory of slain Kremlin critic Boris Nemtsov. Organizers of the event said about 70,000 people marched in Moscow on March 1, while Russian police said only about 7,000 people were involved. The march began after thousands of people piled flowers on the bridge near the Kremlin where the opposition politician and former deputy prime minister was shot dead late on February 27.
Thousands Join Nemtsov Memorial March In Moscow

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Marchers hold up a poster with Boris Nemtsov's portrait saying: "Heroes do not die. These bullets -- in each of us."

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Petr Tsarkov, co-chairman of the Solidarity opposition movement, holds a poster of Nemtsov during the memorial march.

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Riot police stand guard during the march to commemorate Nemtsov.

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A man holds a Ukrainian national flag during the Nemtsov march.

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Someone holds up a sign saying "I'm not afraid" in front of the Moscow march in memory of Boris Nemtsov.