As diplomats from around the world sought a global strategy to fight Islamic State extremists, Iran ruled out working with any international coalition, saying it had rejected American requests for cooperation against the militants.

Iraq's new president on Monday snubbed the powerful incumbent Prime Minister Nouri al-Maliki and nominated the deputy parliament speaker to form the new government.

Iraqi officials say a double car bombing in central Baghdad has killed 21 people and wounded 33, hours after lawmakers elected the country's new president.