The United States and Turkey are finalizing plans for a military campaign to push ISIS out of a strip of Syrian territory along the Turkish border, a move that would further embroil Turkey in Syria's civil war and set up a potential conflict with U.S.-backed Kurdish forces.



In a series of cross border strikes since Friday, Turkey has not only targeted ISIS but also Kurdish fighters affiliated with forces battling the extremists in Syria and Iraq.



Syria's main Kurdish fighting force is affiliated with the Kurdistan Workers' Party, or PKK, which waged a decades-long insurgency in Turkey and maintains bases in remote parts of northern Iraq.



On Monday Syria's main Kurdish militia and an activist group said Turkish troops had shelled a Syrian village near the border, targeting Kurdish fighters.



A government official said Turkey returned fire after Turkish soldiers at the border were fired upon, in line with Turkey's rules of engagement.



In comments published Monday, Turkish Prime Minister Ahmet Davutoglu said Turkey and the United States had no plans to send ground troops into Syria but said they had agreed to provide air cover to moderate Syrian fighters.

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