The head of Russia's Federal Security Service announced that two suspects have been detained Saturday in the murder of Russian opposition leader Boris Nemtsov, NBC News reported. Anzor Gubashev and Zaur Dadayev were detained, FSB director Alexander Bortnikov said on Russia's state-run TV network Channel One. He said they were "suspected of carrying out this crime," but it was not clear if either of the suspects was believed to have fired the shots that killed Nemtsov. No charges were immediately announced. Nemtsov, an outspoken critic of Russian President Vladimir Putin, was gunned down last month near the Kremlin in Moscow.