Twin blasts Saturday near holy shrines frequented by Shiites in the Syrian capital Damascus killed at least 40 people, most of them Iraqis, according to Syrian and Iraqi officials.

Five weeks after a military operation began, a senior Iraqi commander declared Sunday that the city of Fallujah was "fully liberated" from the Islamic State group.

The Islamic State group claimed responsibility for a suicide bombing at a Shiite mosque in Saudi Arabia, warning that more "black days" loom ahead in a direct challenge to the rulers of the Sunni kingdom.