MOSCOW (AP) — The suburban Moscow concert hall where gunmen opened fire on concertgoers was a blackened, smoldering ruin Saturday as the death toll in the attack surpassed 130 and Russian authorities arrested four suspects. President Vladimir Putin claimed they were captured while fleeing to Ukraine.
Kyiv strongly denied any involvement in Friday’s attack on the Crocus City Hall music venue in Krasnogorsk, and the Islamic State group’s Afghanistan affiliate claimed responsibility.
Putin did not mention IS in his speech to the nation Saturday, and Kyiv accused him and other Russian politicians of falsely linking Ukraine to the assault in order to stoke fervor in Russia’s war in Ukraine, which recently entered its third year.
A U.S. intelligence official told The Associated Press that U.S. agencies confirmed the IS was responsible for the assault. U.S. intelligence agencies gathered information in recent weeks that the IS branch was planning an attack in Moscow, and privately shared the intelligence with Russian officials earlier this month, the official said.
Putin said authorities detained a total of 11 people in the attack, which also wounded more than 100. He called it “a bloody, barbaric terrorist act” and said Russian authorities captured the four suspected gunmen as they were trying to escape to Ukraine through a “window” prepared for them on the Ukrainian side of the border.
Russian media broadcast videos that apparently showed the detention and interrogation of the suspects, including one who told the cameras he was approached by an unidentified assistant to an Islamic preacher via a messaging app channel and paid to take part in the raid.
Russian news reports identified the gunmen as citizens of Tajikistan, a former Soviet country in Central Asia that is predominantly Muslim and borders Afghanistan. Up to 1.5 million Tajiks have worked in Russia and many have Russian citizenship.
Many Russian hard-liners called for a crackdown on Tajik migrants, but Putin appeared to reject the idea, saying “no force will be able to sow the poisonous seeds of discord, panic or disunity in our multi-ethnic society.”
He declared Sunday a day of mourning and said additional security measures were imposed throughout Russia.
The number of dead stood at 133 on Saturday, making the attack the deadliest in Russia in years. Authorities said the death toll could still rise.

The attack came two weeks after the U.S. embassy in Moscow issued a notice urging Americans to avoid crowded places in view of “imminent” plans by extremists to target large Moscow gatherings, including concerts. Several other Western embassies repeated the warning. Earlier this week, Putin denounced the warning as an attempt to intimidate Russians.
Some commentators on Russian social media questioned how authorities, who have relentlessly suppressed any opposition activities and muzzled independent media, failed to prevent the attack despite the U.S. warnings.
Investigators on Saturday combed through the charred wreckage of the hall for more victims. Hundreds of people stood in line in Moscow to donate blood and plasma, Russia’s health ministry said.

Images shared by Russian state media Saturday showed emergency vehicles still gathered outside the ruins of Crocus City Hall, which could hold more than 6,000 people.
On Friday, crowds had gathered at the venue for a concert by the Russian rock band Picnic.
Videos posted online showed gunmen in the venue shooting civilians at point-blank range. Russian news reports cited authorities and witnesses as saying the attackers threw explosive devices that started the fire, which eventually consumed the building and caused its roof to collapse.

IS, which lost much of its ground after Russia’s military action in Syria, has long targeted Russia. In a statement posted by the group’s Aamaq news agency Friday, IS’s Afghanistan affiliate said it had attacked a large gathering of “Christians” in Krasnogorsk.
The group issued a new statement Saturday saying the attack was carried out by four men who used automatic rifles, a pistol, knives and firebombs. It said the assailants fired at the crowd and used knives to kill some concertgoers, casting the raid as part of IS’s ongoing war with countries that it says are fighting Islam.