Turkey will let U.S. and coalition forces use its bases, including a key installation within 100 miles of the Syrian border, for operations against Islamic State militants in Syria and Iraq, American defense officials said Sunday, Oct 12, according to the Associated Press.

The Obama administration had been pressing Ankara to play a larger role against the extremists, who have taken control of large swaths of Syria and Iraq, including territory on Turkey's border, and sent refugees fleeing into Turkey.

U.S. officials confirmed Saturday that Ankara had agreed to train Syrian moderate forces on Turkish soil. A Turkish government official said Sunday that Turkey put the number at 4,000 opposition fighters and said they would be screened by Turkish intelligence.

Also Sunday, officials confirmed that Turkey agreed to let U.S. and coalition fighter aircraft launch operations against Islamic State militants in Iraq and Syria from Turkish bases, including Incirlik Air Base in the south. U.S. Defense Secretary Chuck Hagel, who has been traveling in South America, has said the U.S. wanted access to the Turkish bases.

The officials spoke on condition of anonymity because they were not authorized to discuss private talks between the Americans and Turks, according to the AP.

U.S. Central Command said warplanes from the United States, Saudi Arabia and the United Arab Emirates launched airstrikes on four locations in Syria on Saturday and Sunday, including three in Kobani, a Kurdish town, where fierce fighting continues, that destroyed an Islamic State fighting position and staging area.

Beyond the training and bases, there are other issues the U.S. hopes Turkey will agree to. U.S. officials have not said what all of those would be because discussions are underway, the AP reports.

Earlier Sunday, President Barack Obama's national security adviser, Susan Rice, made clear the U.S. has not asked "the Turks to send ground forces of their own into Syria."

American officials are "continuing to talk to the Turks about other ways that they can play an important role. They are already essential to trying to prevent the flow of foreign fighters" and prevent extremists from exporting oil through Turkey. "So Turkey has many ways it can contribute," Rice said.