More than 60 people were killed and about 115 others injured after gunmen opened fire at them in a Moscow concert hall, Russian authorities said, raising an earlier count of 40.

Russia’s Health Minister Mikhail Murashko said 115 people were hospitalised, including five children, one of whom was in grave condition. Of the 110 adult patients, 60 were in serious condition, he said.

The Islamic State group claimed responsibility for the attack, saying its fighters attacked “a large gathering” on Moscow’s outskirts and “retreated to their bases safely”.

Attackers dressed in camouflage uniforms entered the building, opened fire and threw grenades or incendiary bombs. Videos showed images of flames and black smoke pouring from the hall. Three helicopters were involved in efforts to put out the fire, dumping water on the giant concert hall that can hold several thousand people and has hosted top international artists.

Scores of people hid behind seats in the hall or rushed towards entrances to the basement or roof to escape the bullets. Shortly after midnight, the emergencies ministry said the fire had been contained.

The European Union, France, Spain and Italy joined several countries in condemning the attack. The US called the attack “terrible” and said there was no immediate sign of any link to the conflict in Ukraine.