(Reuters) - The United Nations is concerned by the presence of Islamic State in Afghanistan but says the militant group's power to unite insurgents is more significant than its capabilities in the war-torn country, a top U.N. official said on Monday. U.N. envoy Nicholas Haysom...

(Reuters) -  Iraq  needs more airstrikes to dislodge Islamic State militants from Tikrit, senior officials said on Monday, as the campaign to retake Saddam Hussein's home city stalled for a fourth day due to homemade bombs and booby traps. Iraqi security forces and mainly...

(Reuters) - Any terms that world powers grant  Iran  under a nuclear deal will be sought bySaudi Arabia and other countries, risking wider proliferation of atomic technology, a senior Saudi prince warned on Monday in a BBC interview. "I've always said whatever comes out...

(Reuters) - Three male British teenagers suspected of planning to join Islamic State militants in  Syria  have been arrested by London police after being deported from Turkey, officials said. The three, who have not been named, were detained on Friday in the Turkish city...