ISIL-K is an offshoot of the Islamic State of Iraq and the Levant (identified as ISIS), which had been seeking to establish a new caliphate in Iraq and Syria.
It was formed in 2014 by separatists fighters of the Pakistan Taliban and combatants from Afghanistan who vowed allegiance to the late ISIS leader Abu Bakr al-Baghdadi.
The Islamic State in Khorasan Province, also known as ISIL-K, has taken responsibility for the deadly suicide attacks outside Kabul international airport that killed at least 170 Afghans and 13 US soldiers, and leaving dozens injured.