ISIS-K was responsible for the suicide bomber attack outside the Kabul airport on Aug 25 during troop withdrawal that killed up to 170 civilians and 13 U.S. troops. The group has also claimed responsibility for many high-profile attacks, including the May bombing of Kabul's girls' school. ISIS-K claimed responsibility for a series of bomb attacks in Jalalabad in eastern Afghanistan on Sunday.
In a Pentagon briefing after the attack, Gen. Kenneth McKenzie, the head of U.S. Central Command, said that "the threat from ISIS is extremely real."
The Islamic State of Khorasan Province, or ISIS-K, is a transnational group founded six years ago in Pakistan in January 2015.
Khorasan province no longer exists. Iran, Turkmenistan, Afghanistan, Uzbekistan, and Tajikistan were all part of the ancient Khorasan region.