More than 60 people were killed and at least 145 injured when gunmen dressed in camouflage opened fire at a popular hall near Moscow as crowds gathered for a Russian rock band concert.
The death toll includes three children, officials from the regional healthcare ministry said. The ISIS later claimed responsibility for the attack.
The attack, involving at least four gunmen, sparked a huge fire at the Crocus City Hall, reportedly causing the roof to collapse, according to state media.
Dramatic video footage showed concertgoers taking cover as shots and explosions were heard. Children were said to have been among the crowds. Some people are thought to have fled to the basement, and others to the roof to escape from the shooting.
Russia’s Federal Security Service said “all possible measures are being taken to provide assistance to those affected” by the shooting.
“The special services are carrying out active search measures following the emergency in the Crocus complex,” it added.
The US embassy in Russia said it was aware of reports of a terrorist incident. Russian prosecutors called the attack “an act of terrorism” and have opened a criminal case.