The Vatican's ambassador in Geneva has said the use of force will be necessary to protect minority groups from Islamic State aggression if a political solution cannot be achieved.
Iraqi Kurdish authorities said on Saturday they had evidence that Islamic State had used chlorine gas as a chemical weapon against their peshmerga fighters in northern Iraq in January.
The leader of the Islamic State militant group that controls tracts of Syria and Iraqhas accepted a pledge of allegiance from Nigerian Islamists Boko Haram, his spokesman said, calling on supporters to fight in Africa.