https://www.npr.org/2021/08/26/ [login to see] /isis-k-taliban-who-what-you-need-to-know
The group known as ISIS-K had long planned attacks on American personnel and others. That's one reason why President Biden said he wanted to limit the duration of the U.S. withdrawal from Afghanistan.
On Thursday, this regional affiliate of the Islamic State struck at the heart of Kabul, setting off an explosion outside Hamid Karzai International Airport and another at the nearby Baron Hotel. The attacks killed more than 150 Afghan civilians and at least 13 U.S. service members.
Here's what is known about the group, which reportedly has claimed responsibility for Thursday's bombings: