The death toll of the Moscow concert hall attack has risen to 60 people, authorities said on Saturday, as a “terrorist” investigation remains under way.

Gunmen dressed in camouflaged uniforms opened fire at the Crocus City concert hall in Moscow’s northern Krasnogorsk suburb on Friday evening, with the Islamic State group claiming responsibility.

The attackers threw a grenade or incendiary bomb, the RIA Novosti news agency reported, and an inferno spread as screaming patrons rushed to emergency exits.

Russia’s Investigative Committee said on Saturday more than 60 people had been killed, raising an earlier toll of 40, according to Russian news agencies.

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

Follow the latest updates below