ISIL-Khorasan (ISIL-K), which announced its formation on January 10, 2015, is based in the Afghanistan-Pakistan region and is composed primarily of former members of Tehrik-e Taliban Pakistan and the Afghan Taliban.
The senior leadership of ISIL-K has pledged allegiance to Abu Bakr al-Baghdadi, the leader of the Islamic State group, the State Department said.
"This pledge was accepted in late January 2015 and since then ISIL-K has carried out suicide bombings, small arms attacks and kidnappings in eastern Afghanistan against civilians and Afghan National Security and Defense Forces, and claimed responsibility for May 2015 attacks on civilians in Karachi, Pakistan," it said.