Photos: Russian opposition march in Moscow mourns Boris Nemtsov

A woman holds a poster that says Boris (Nemtsov’s first name). Russia’s Sputnik news agency reported that authorities are looking for a man of average height with short hair.   (Sergei L. Loiko / Los Angeles Times)

Thousands of people marched to the Kremlin Sunday afternoon to mourn the loss of key opposition figure Boris Nemtsov. They chanted, “We’ll not forget. We’ll not forgive.”   (Sergei L. Loiko / Los Angeles Times)

Marchers carry Russian national flags during an event in memory of slain opposition leader Boris Nemtsov in central Moscow on Sunday. In the background are the Kremlin Wall, left, and St. Basil Cathedral.  (Dmitry Lovetsky / Associated Press)

Opposition marchers carry a banner bearing a portrait of slain Kremlin critic Boris Nemtsov in central Moscow on Sunday.  (Alexander Utkin / AFP/Getty Images)

Opponents of President Vladimir Putin march in memory of slain Kremlin critic Boris Nemtsov in central Moscow on Sunday.  (Dmitry Serebryakov / AFP/Getty Images)

Opponents of President Vladimir Putin march in memory of slain Kremlin critic Boris Nemtsov in central Moscow on Sunday.  (Sergei Gapon / AFP/Getty Images)

People pay respects to Russia’s Boris Nemtsov, a sharp critic of Russian President Vladimir Putin, in front of the Russian Embassy in Vilnius, Lithuania, on Sunday. Nemtsov was gunned down Friday in Moscow near the Kremlin.  (Mindaugas Kulbis / Associated Press)