IS have made enemies across the globe and endured three months of U.S.-led air strikes, but Islamic State fighters have surrendered little of their self-declared caliphate to the broad sweep of forces arrayed against them.
While they have lost towns on the edges of their Iraqi realm, especially in ethnically mixed areas where their hardline Sunni theology holds little appeal, they have consolidated power in parts of their Sunni Muslim heartland.
Islamic State leader Abu Bakr al-Baghdadi, rallying his fighters three weeks ago, said the U.S. despatch of more military advisers to Iraq showed that it is growing instead of being contained "The Crusaders' air strikes and constant bombardment day and night of Islamic State positions have not prevented its advance,"
"Before you defeat your enemy you must understand it, this is the first rule in combat and these idiots missed it."
A UAE woman has been arrested, suspected of murdering an American teacher in a toilet in an Abu Dhabi shopping centre.
Word of the gruesome killing, which left a trail of blood in a public restroom at an Abu Dhabi mall, has rattled the Emirates, a Western-allied, seven-state Gulf federation that includes the glitzy commercial hub of Dubai.
UAE is one of the more prominent Arab members of the U.S.-led coalition conducting airstrikes against the Islamic State group in Iraq and Syria. American and other Western allies rely on air bases in the country, and Emirati fighter pilots have carried out multiple missions as part of the bombing campaign.
The attacker also left a makeshift bomb at the house of a 46-year-old Egyptian-American doctor in the prominent waterfront Corniche area.