LARA JAKES
AP National Security Writer

WASHINGTON (AP) — The U.S. envoy coordinating the global fight against Islamic State militants says officials are still negotiating how much of a role Turkey will take in the burgeoning war on its border.

Retired Marine Gen. John Allen says U.S. military officials are in the Turkish capital of Ankara to discuss how Turkey will contribute to the fight.

Turkey already has agreed to train and equip moderate Syrian rebel forces that have for more than three years sought to oust Syrian President Bashar Assad from power.

Allen on Wednesday would not confirm whether Turkey has agreed to allow the use of Incirlik Air Base as a launching pad for operations against the Islamic State, as other U.S. officials said earlier this week.

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