(CNN) The Pentagon said Friday that US forces have killed Abu Sayed, the leader of ISIS-Khorasan, the terror group's Afghanistan affiliate. The "Emir" of ISIS-K was killed "in a strike on the group's headquarters in Kunar Province, July 11," Chief Pentagon spokesperson Dana White said in a statement. US Navy Captain Bill Salvin, spokesman for US Forces Afghanistan provided additional detail of how Abu Sayed was killed. Salvin said he was killed in an airstrike by a US drone. The initial Pentagon statement described Sayed being killed in a "raid". Secretary of Defense James Mattis told reporters on Friday that the death of  a leader like Sayed "sets them back for a day a week, a month, it's about who it is and what kind of people are below them. It is obviously a victory on our side in terms of setting them back, it's the right direction."The "Emir" of ISIS-K was killed on July 11, according to the PentagonAbu Sayed's death marks the third time an ISIS-K leader has been killed within a year 
 Question:The presence of _ in Kunar is noteworthy, the other two leaders were killed in neighboring Nangarhar province the terror organization's traditional powerbase.
Abu Sayed