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This is a locator map for the Gulf Cooperation Council member states: Saudi Arabia, Bahrain, Qatar, Oman, Kuwait and United Arab Emirates. (AP Photo)

This is a locator map for the Gulf Cooperation Council member states: Saudi Arabia, Bahrain, Qatar, Oman, Kuwait and United Arab Emirates. (AP Photo)

FILE - A general view of the city, in Muscat, Oman, on Sept. 15, 2010. This week's attack on a Shiite mosque in the capital stunned Oman, a quiet nation long spared militant violence. It underscores how the Islamic State group has turned to a strategy of surprise, dramatic strikes outside its usual battlegrounds — a way to show its resilience and inspire new recruits. (AP Photo/Kamran Jebreili, File)

FILE - A general view of the city, in Muscat, Oman, on Sept. 15, 2010. This week's attack on a Shiite mosque in the capital stunned Oman, a quiet nation long spared militant violence. It underscores how the Islamic State group has turned to a strategy of surprise, dramatic strikes outside its usual battlegrounds — a way to show its resilience and inspire new recruits. (AP Photo/Kamran Jebreili, File)