The United States and several Gulf Arab allies have launched air and missile strikes on ISIL targets in Syria, US officials said, opening a new, far more complicated front in the battle against the militants.
"I can confirm that US military and partner nation forces are undertaking military action against (ISIL) terrorists in Syria using a mix of fighter, bomber and Tomahawk Land Attack Missiles," Rear Admiral John Kirby, Pentagon press secretary, said in a statement on Monday.
"Given that these operations are ongoing, we are not in a position to provide additional details at this time."
A US official, speaking on condition of anonymity, said that Saudi Arabia, the United Arab Emirates, Jordan and Bahrain were involved although their exact roles in the military action were unclear. Qatar played a supporting role in the air strikes, the official said.