Russian President's Flag flies at half mast over the Kremlin in Moscow, Russia, Sunday, March 24, 2024. Russia observed a national day of mourning on Sunday, two days after an attack on a suburban Moscow concert hall that killed over 130 people. (AP Photo/Vitaly Smolnikov)
Russian President's Flag flies at half mast over the Kremlin in Moscow, Russia, Sunday, March 24, 2024. Russia observed a national day of mourning on Sunday, two days after an attack on a suburban Moscow concert hall that killed over 130 people. (AP Photo/Vitaly Smolnikov)
Russian President Vladimir Putin lights a candle to commemorate the victims of an attack on the Crocus City Hall concert venue, on the day of national mourning, in Russia, Sunday, March 24, 2024. (Mikhail Metzel, Sputnik, Kremlin Pool Photo via AP)
Russian President Vladimir Putin lights a candle to commemorate the victims of an attack on the Crocus City Hall concert venue, on the day of national mourning, in Russia, Sunday, March 24, 2024. (Mikhail Metzel, Sputnik, Kremlin Pool Photo via AP)
Police officers walk near the Basmanny District Court in Moscow, Russia, Sunday, March 24, 2024. The suburban Moscow concert hall where gunmen opened fire on concertgoers was a blackened, smoldering ruin as the death toll in the attack surpassed 130 and Russian authorities arrested four suspects. (AP Photo/Alexander Zemlianichenko)
Russian President Vladimir Putin addressees the nation in Moscow, Russia, Saturday, March 23, 2024. Russian President Vladimir Putin said Saturday that authorities have detained 11 people in the attack on a suburban Moscow concert hall that killed at least 115 people and left the sprawling venue a smoldering ruin. (Mikhail Metzel, Sputnik, Kremlin Pool Photo via AP)
People react next to the Crocus City Hall, on the western edge of Moscow, Russia, Saturday, March 23, 2024. Russia's top state investigative agency says the death toll in the Moscow concert hall attack has risen to over 133. The attack Friday on Crocus City Hall, a sprawling mall and concert venue on Moscow's western edge, also left many wounded and left the building a smoldering ruin. (AP Photo/Alexander Zemlianichenko)
People lay flowers at a spontaneous memorial in memory of the victims of Moscow attack in St. Petersburg, Russia, Sunday, March 24, 2024. Russia observed a national day of mourning on Sunday, two days after an attack on a suburban Moscow concert hall that killed over 130 people. (AP Photo/Dmitri Lovetsky)
Moscow Mayor Sergei Sobyanin speaks to a wounded person after an attack at the Crocus City Hall, in the hospital in Moscow, Russia, Saturday, March 23, 2024. Russia's top state investigative agency says the death toll in the Moscow concert hall attack has risen to over 133. The attack Friday on Crocus City Hall, a sprawling mall and concert venue on Moscow's western edge, also left many wounded and left the building a smoldering ruin. (Vladimir Novikov/Moscow Mayor press service via Moscow News Agency via AP)
People lay flowers and light candles standing next to the Crocus City Hall, on the western edge of Moscow, Russia, Saturday, March 23, 2024. Russia's top state investigative agency says the death toll in the Moscow concert hall attack has risen to over 133. The attack Friday on Crocus City Hall, a sprawling mall and concert venue on Moscow's western edge, also left many wounded and left the building a smoldering ruin. (AP Photo/Alexander Zemlianichenko)
A woman reacts as she comes to place flowers at the fence next to the Crocus City Hall, on the western edge of Moscow, Russia, Sunday, March 24, 2024. The suburban Moscow concert hall where gunmen opened fire on concertgoers was a blackened, smoldering ruin as the death toll in the attack surpassed 130 and Russian authorities arrested four suspects. (AP Photo/Vitaly Smolnikov)
In this photo released by the Russian Emergency Ministry Press Service on Saturday, March 23, 2024, Russian Emergency Ministry rescuers work inside the Crocus City Hall on the western edge of Moscow, Russia, Saturday, March 23, 2024, following an attack Friday, for which the Islamic State group claimed responsibility. Over 90 people were killed authorities said. (Russian Emergency Ministry Press Service via AP)
Russian President Vladimir Putin gestures while speaking on a visit to his campaign headquarters after a presidential election in Moscow, Russia, early Monday, March 18, 2024. (AP Photo/Alexander Zemlianichenko)
In this photo taken from video released by Russian Emergency Ministry Press Service on Sunday, March 24, 2024, rescuers work in the burned concert hall after a terrorists attack on the building of the Crocus City Hall on the western edge of Moscow, Russia. Russia's top state investigative agency says the death toll in the Moscow concert hall attack has risen to 133. The attack Friday on Crocus City Hall, a sprawling mall and concert venue on Moscow's western edge, also left many wounded and left the building a smoldering ruin. (Russian Emergency Ministry Press Service via AP)