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Head of Russia's security agency says 2 suspects detained in killing of Boris Nemtsov

  • Flowers, votive candles and portraits are seen at the place where Boris Nemtsov, a charismatic Russian opposition leader and sharp critic of President Vladimir Putin, was gunned down on Friday, Feb. 27, 2015 near the Kremlin, in Moscow, Russia, Thursday, March 5, 2015. President Vladimir Putin on Wednesday called the slaying of his top critic a "disgrace" to Russia, while the opposition promised to complete Nemtsov's work on a report documenting evidence of Russian troops' involvement in fighting in eastern Ukraine. (AP Photo/Alexander Zemlianichenko)

    Flowers, votive candles and portraits are seen at the place where Boris Nemtsov, a charismatic Russian opposition leader and sharp critic of President Vladimir Putin, was gunned down on Friday, Feb. 27, 2015 near the Kremlin, in Moscow, Russia, Thursday, March 5, 2015. President Vladimir Putin on Wednesday called the slaying of his top critic a "disgrace" to Russia, while the opposition promised to complete Nemtsov's work on a report documenting evidence of Russian troops' involvement in fighting in eastern Ukraine. (AP Photo/Alexander Zemlianichenko)  (The Associated Press)

  • Flowers and a portrait are laid at the place where Boris Nemtsov, a charismatic Russian opposition leader and sharp critic of President Vladimir Putin, was gunned down on Friday, Feb. 27, 2015 near the Kremlin, in Moscow, Russia, Thursday, March 5, 2015. Putin on Wednesday called the slaying of his top critic a "disgrace" to Russia, while the opposition promised to complete Nemtsov's work on a report documenting evidence of Russian troops' involvement in fighting in eastern Ukraine. (AP Photo/Alexander Zemlianichenko)

    Flowers and a portrait are laid at the place where Boris Nemtsov, a charismatic Russian opposition leader and sharp critic of President Vladimir Putin, was gunned down on Friday, Feb. 27, 2015 near the Kremlin, in Moscow, Russia, Thursday, March 5, 2015. Putin on Wednesday called the slaying of his top critic a "disgrace" to Russia, while the opposition promised to complete Nemtsov's work on a report documenting evidence of Russian troops' involvement in fighting in eastern Ukraine. (AP Photo/Alexander Zemlianichenko)  (The Associated Press)

  • Mourners following the Russian tradition of memorialising a person nine days after a death lay flowers and votive candles at the place where Boris Nemtsov, a charismatic Russian opposition leader and sharp critic of President Vladimir Putin, was gunned down on Friday, Feb. 27, 2015 near the Kremlin, in Moscow, on Saturday, March 7, 2015.  Two suspects have been detained in the killing a week ago of opposition politician Boris Nemtsov, the head of Russia's federal security service said Saturday, an announcement received with both skepticism and reserved satisfaction by some of Nemtsov's comrades.(AP Photo/Alexander Zemlianichenko)

    Mourners following the Russian tradition of memorialising a person nine days after a death lay flowers and votive candles at the place where Boris Nemtsov, a charismatic Russian opposition leader and sharp critic of President Vladimir Putin, was gunned down on Friday, Feb. 27, 2015 near the Kremlin, in Moscow, on Saturday, March 7, 2015. Two suspects have been detained in the killing a week ago of opposition politician Boris Nemtsov, the head of Russia's federal security service said Saturday, an announcement received with both skepticism and reserved satisfaction by some of Nemtsov's comrades.(AP Photo/Alexander Zemlianichenko)  (The Associated Press)

The head of Russia's federal security service said Saturday that two suspects have been detained in the killing a week ago of opposition politician Boris Nemtsov.

Alexander Bortnikov made the statement on state television. He said the two suspects were from Russia's North Caucasus region, but no other details were given.

It was not clear if either of the suspects was believed to have fired the shots that killed Nemtsov as he walked over a bridge with a companion near the Kremlin on Feb. 28.

Nemtsov's killing shocked Russia's already beleaguered and marginalized opposition supporters. Suspicion in the opposition is high that the killing was ordered by the Kremlin in retaliation for Nemtsov's adamant criticism of President Vladimir Putin. The 55-year-old was reportedly working on a report about Russian military involvement in the eastern Ukraine conflict.

But Russia's top investigative body said it was investigating several possible motives, including that he was killed in an attempt to smear Putin's image. It also said it was looking into possible connections to Islamic extremism and Nemtsov's personal life.