(Reuters) - U.S. President Barack Obama will propose to Congress on Wednesday a new three-year authorization for the use of force against Islamic State with limits on U.S. combat troops' involvement, lawmakers and congressional aides said. Obama has defended his authority...

(Reuters) - U.S. aid worker Kayla Mueller, held hostage by Islamic State militants for 18 months, is dead, her family said on Tuesday, but the circumstances were unclear and President Barack Obama vowed to hunt down the culprits. Mueller's family received an email and...

(Reuters) - Syrian President Bashar al-Assad said third parties including Iraq were conveying information to Damascus about the U.S.-led campaign of air strikes against the Islamic State militant group in Syria. In an interview with the BBC...

Jordan's air force chief said on Sunday his country's jet fighters had conducted 56 bombing raids in three days against Islamic State militants in northeast  Syria , targeting key bases and arms depots. Jordan stepped up its bombing of the jihadist group on Thursday in...