The group claiming responsibility for Thursday's bombings near Kabul's airport, which killed 13 US service members and at least 95 Afghans, is the Islamic State Khorasan, or ISIS-K. This is the affiliate of the Islamic State in Afghanistan and Pakistan. What we know:
- How it formed: ISIS-K formed in late 2014. ISIS representatives sent to Pakistan and Afghanistan "were essentially able to co-opt some disaffected Pakistani Taliban and a few Afghan Taliban [members] to join their cause," Seth Jones of the Center for Strategic and International Studies (CSIS) tells NPR. Some more extremist Taliban members have also defected in recent years amid Taliban attempts to negotiate with the US, per the AP.