Ms Rice said the US welcomed the new agreement, which included use of the Incirlik air base in Turkey's south.

 

The US is leading air strikes against IS, which has seized large parts of Iraq and Syria in recent months.

 

Turkey shares a border with both countries, but has so far ruled out any ground operation of its own.

 

Speaking to US broadcaster NBC, Ms Rice said Turkey had recently agreed to let the US use Turkish bases and territory "to train moderate Syrian opposition³ forces" and "engage in activities inside of Iraq and Syria".

 

"That's the new commitment, and one that we very much welcome," she added.

 

In recent days, IS fighters have advanced against the Syrian town of Kobane, which has a border crossing point with Turkey.

 

The militants, who control some areas of Kobane, have been subjecting the rest of the town to a heavy bombardment but are continuing to meet stiff resistance from Kurdish forces there. 

 

Neither side has been able to gain significant ground, despite the US-led coalition⁴ carrying out air strikes in support of the Kurds.

 

Turkey has ranged its military forces on the border but has so far ruled out any ground operation on its own, and has refused to allow Kurds in Turkey to cross the border to fight.

 

Turkey has been reluctant to get involved militarily, partly because it is concerned about arming the Kurdish forces fighting IS militants. Turkey fought a long civil war with its Kurdish minority.

 

Since the IS offensive against Kobane began in mid-September, some 500 people have been killed and up to 200,000 have fled across the border into Turkey.

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