An U.S. F16 fighter jet takes off from a Romanian air base in Campia Turzii, Romania, Thursday, April 10, 2014.

U.S. special forces and experts are setting up an airbase in northeast Syria as part of the battle against the Islamic State of Iraq and Syria (ISIS) group, Syrian military and security sources said Saturday.

They told AFP work was underway to expand an airfield in Rmeilan, in Hasakeh province, from where aircraft used to take off to spray pesticides on crops before Syria’s war started five years ago.

A Syrian military source said nearly 100 “American experts,” alongside forces from the anti-ISIS Kurdish People’s Protection Units had widened the landing strip and refurbished some infrastructure.

“The airbase will be used for helicopters and cargo planes. Its strip is now 2,700 metres (yards) long and is ready to be used by planes that will transport equipment and ammunition,” the source added.

The Pentagon did not confirm the reports but said the U.S. military had not taken control of any airfield in Syria.

“There has been no change to the size of mission of the U.S. presence in Syria,” added U.S. Central Command spokesman Colonel Pat Ryder.

“That being said, U.S. forces in Syria are consistently looking at ways to increase efficiency for logistics and personnel recovery support,” he said.

At the end of October, US President Barack Obama authorized the deployment of up to 50 special operations troops to Syria to advise local ground forces battling ISIS.

The military source told AFP that U.S forces have been working on the Rmeilan airfield “for more than three months.”

A security source in northeast Syria said “American special forces and advisors are using the Rmeilan airport as a base, from where helicopters are taking off towards the fronts.”

The Britain-based Syrian Observatory for Human Rights said the airstrip has been widened and “is nearly ready for us by American planes”.

The U.S. is supporting a Kurdish-Arab alliance called the Syrian Democratic Forces against ISIS in northern Syria, providing it with air cover as part of a broad coalition battling ISIS.

SDF spokesman Talal Sello denied that U.S. forces had taken over the Rmeilan, describing it as “an agricultural airport.”

The U.S.-led coalition began bombing ISIS targets in Syria in September 2014, expanding their mission from neighboring Iraq.

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