UNITED NATIONS (AP) — A new United Nations report says the world is facing a challenge from foreigners traveling to fight in terror groups on an "unprecedented scale," with about 15,000 in Syria and Iraq alone.

The report by a panel of experts monitoring al-Qaida and the Taliban, obtained Friday by The Associated Press, has been submitted to the U.N. Security Council.

The panel says fighters from more than 80 countries working with al-Qaida associates in Syria and Iraq "form the core of a new diaspora that may seed the threat for years to come."

The report adds that the increasingly sophisticated use of social media is giving the Islamic State group a "cosmopolitan" appearance.

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