Thousands Join Nemtsov Memorial March In Moscow

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

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

Riot police stand guard during the march to commemorate Nemtsov.

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

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