Story highlights The soldier was killed Saturday while conducting operations in Afghanistan against Khorasan, the local branch of ISIS there

The soldier was mortally wounded late Saturday during an operation in Nangarhar Province

(CNN) An Army Special Forces soldier was killed while conducting counterterrorism operations in Afghanistan late Saturday, US forces in Afghanistan have announced in a release.

The soldier was mortally wounded while helping Afghan forces conduct operations against Khorasan, the local branch of the Islamic State of Iraq and Syria, Navy Capt. Bill Salvin, a spokesman for the NATO-led coalition in Afghanistan, told CNN.

The commander of US forces in Afghanistan, Gen. John W. Nicholson, offered "deepest condolences to the family and friends of our fallen comrade" on behalf of all US forces there. "We will always remember our fallen comrades and commit ourselves to deliver on their sacrifice."

US troops regularly perform counterterrorism operations against the ISIS affiliate, which has a presence in Nangarhar Province, where the soldier was killed. Those operations are sometimes carried out in conjunction with Afghan forces.

The US counterterrorism mission is separate from the NATO-led effort to train, advise and assist the Afghan army and police force.

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