The Islamic State group claimed responsibility for a gun attack on a Moscow concert hall on Friday, which Russian investigators said killed over 60 people.

Russia’s National Guard said it was on the scene and looking for the perpetrators of the attack, which a regional ministry reported left another 145 people were wounded.

“The bodies of the deceased are currently being examined. It is provisionally established that more than 60 people died in the terrorist attack. Unfortunately, the number of victims could rise,” said the Investigative Committee.