The Islamic terror group Islamic State claimed responsibility for a terror attack on a Moscow concert hall on Friday (local time), which killed more than 60 people and injured more than 100 people.

The terror group took responsibility for the attack in a short statement published by ISIS-affiliated news agency Amaq on Telegram on Friday.

IS ‘fighters’ attacked a large gathering… on the outskirts of the Russian capital Moscow, the terror group said in a statement. The IS statement said the attackers had “retreated to their bases safely”.

A group of armed men stormed into Crocus City Hall concert venue in Moscow and opened fire and detonated explosives among the crowd on Friday. Attackers dressed in camouflage uniforms entered the building, opened fire and threw a grenade or incendiary bomb, according to a journalist for the RIA Novosti news agency at the scene.

The US officials said they had privately apprised Russian officials about the intelligence pointing to an impending attack, the New York Times has reported. The US collected intelligence in March that Islamic State-Khorasan, known as ISIS-K, the branch of the group based in Afghanistan, had been planning an attack on Moscow, according to officials. ISIS members have been active in Russia, a US official said.

“ISIS-K has been fixated on Russia for the past two years,” frequently criticizing President Vladimir V. Putin in its propaganda, said Colin P. Clarke, a counterterrorism analyst at the Soufan Group, a security consulting firm based in New York. “ISIS-K accuses the Kremlin of having Muslim blood in its hands, referencing Moscow’s interventions in Afghanistan, Chechnya and Syria.”