U.S. Defense Secretary Chuck Hagel says the U.S. wants to know how far Turkey is willing to go in helping train and equip moderate opposition fighters trying to topple Syrian President Bashar Assad.

Turkey has agreed to support efforts to train and equip the Syrian opposition. Hagel says the United States wants to know whether Ankara is willing to do the training inside Turkey itself.

Saudi Arabia, for instance, has agreed to host training facilities for Syrian rebels on its territory.

Assad's forces continue to fight opposition forces, but that civil war — now in its fourth year — has been eclipsed by Islamic militants' battle trying to overrun the city of Kobani along Syria's border with Turkey.

Hagel spoke Friday in Colombia where he was meeting military officials.