A US drone strike killed an ISIS affiliate - Abu Sayeed Orakzai in Afghanistan on Sunday.
"I would also add that the United States unrelentingly continues its counterterrorism efforts against ISIS-K, Al-Qaeda, and other regional and international terrorist groups," O'Donnell said in a statement.
The ISIS-K leader was responsible for a number of bombings that claimed lives of hundreds of civilians.
Ten other ISIS fighters were also killed in the airstrikes, which was launched in the Nangarhar province, near the border with Pakistan.
The air strikes by the US military in Afghanistan has been increased over the past year.
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