At least 115 people have been killed and 145 wounded in Russia’s worst terror attack in years, as gunmen in combat fatigues opened fire and detonated explosives in a major concert hall on the outskirts of Moscow.

Russian media say authorities have detained 11 people.

Three children were among the dead, Ria cited the regional healthcare ministry as saying on Saturday. Authorities had earlier said five children were among the victims and that about 60 people were in serious condition.

Islamic State claimed responsibility for the attack late on Friday, in a post on Telegram in which the group claimed its gunmen had managed to escape afterwards. A US official said Washington had intelligence confirming Islamic State’s claim.