Moscow concert hall attack death toll rises to 133. Catch up here

Law enforcement officers stand guard outside Crocus City Hall concert venue, following a shooting in Moscow on March 22. Yulia Morozova/Reuters

Russia is reeling on Saturday following a deadly assault on the outskirts of the capital that saw armed attackers enter a popular concert venue complex and open fire.

The incident is the deadliest terror attack in Moscow in decades.

Here are the latest developments:

• Death toll rises: At least 133 people are known to have been killed at the Crocus City complex, home to a popular music hall and shopping center, according to the latest update from Russia’s Investigative Committee on Saturday. Additionally 121 others were injured in the incident – 44 of whom are in serious condition, including two children.
• Suspects detained: Four of the men believed to be involved in the attack were taken into custody while near Russia’s border with Ukraine, the committee also said. Ukraine has strenuously denied any connection with the attack. 
• ISIS claims responsibility: The militant group claimed responsibility for the assault in a short statement published by ISIS-affiliated Amaq news agency on Telegram on Friday. It did not provide evidence to support the claim.
• Prior warning: American officials had warned Moscow that ISIS militants were determined to target Russia in the days before assailants stormed the concert hall, but President Vladimir Putin rejected the advice as “provocative.” His position came despite Russian authorities having reported several ISIS-related incidents within the past month.
• Putin condemns attack: Russia's President Vladimir Putin expressed his deep condolences in a video statement released Saturday, calling the attack a "barbaric terrorist act."
• Global reaction: Many world leaders have swiftly denounced the attack. British Foreign Secretary David Cameron on Saturday said “the UK condemns in the strongest terms the deadly terrorist attack” as did German Chancellor Olaf Scholz, who conveyed that his nation’s “thoughts are with the families of all the victims and all those injured.” French President Emmanuel Macron expressed solidarity with all Russians. Meanwhile, the United Nations Security Council labeled it a "heinous and cowardly" attack