That was followed by a separate confirmation from U.S. forces in Afghanistan, who said that Hasib and "several other high-ranking" IS leaders were killed in the operation on April 27 in the eastern Nangarhar province, along with 35 other extremist fighters, DW wrote.

Read alsoSuicide attack on NATO convoy in Kabul kills eight civilians – mediaThe deaths of Hasib and his associates would "significantly degrade ISIS-K (the name given to IS affiliates active in the Khorasan province) operations in Afghanistan and help reach our goal of destroying them in 2017," the U.S. military said in a statement.

The commander of U.S. forces in Afghanistan, General John Nicholson, said that the "successful joint operation is another important step in our relentless campaign" to wipe out the Islamist group. According to Pentagon estimates, around 1,000 IS fighters remain active in Afghanistan.