Explainer-Why did ISIS-K attack a Moscow theater?

Rescuers work to extinguish fire at the burning Crocus City Hall concert venue following a shooting incident, outside Moscow, Russia, March 22, 2024. REUTERS/Maxim Shemetov

WASHINGTON (Reuters) - The U.S. has intelligence confirming Islamic State's claim of responsibility for a deadly shooting attack at a concert near Moscow on Friday, a U.S. official told Reuters.

Here is information about the Islamic State's Afghan branch known as ISIS-K and their motives for attacking Russia: