President Biden stated Thursday that he has actually ordered up strategies to strike ISIS-K targets following the attack near the Kabul airport. “To those who performed this attack as well as anyone who wants America damage understand this: We will not forgive. We will not forget. We will hunt you down and make you pay,” Biden said. ISIS in Khorasan, referred to as ISIS-K, claimed that an ISIS militant performed the suicide attack, however supplied no proof to support the claim.US authorities have actually been cautioning over the previous week that a danger of a terror attack at the airport was ending up being more acute. Earlier on Thursday regional time, United States diplomats in Kabul alerted American citizens to “right away” leave numerous gates into the airport, pointing out security threats.But who are ISIS-K? ISIS-Khorasan is a branch of the fear group that first emerged in Syria and Iraq. While the affiliates share an ideology and methods, the depth of their relationship with regards to company and command and control has actually never been totally established.US intelligence authorities formerly told CNN the ISIS-K membership consists of “a small number of veteran jihadists from Syria and other foreign terrorist fighters,” saying that the United States had actually recognized 10 to 15 of their leading operatives in Afghanistan. The groups name originates from its terminology for the area that includes Afghanistan and Pakistan: “Khorasan.” The US Defense Department Inspector-General for Afghanistan (SIGAR) said in a report covering the months April to June of this year that “ISIS-Khorasan exploited the political instability and rise in violence during the quarter by assaulting minority sectarian targets and facilities to spread out fear and highlight the Afghan federal governments failure to offer adequate security.”ISIS-K has actually formed cells in Kabul which have performed a variety of ravaging suicide attacks in and beyond the Afghan capital given that 2016. The group has developed a presence in eastern Afghanistan recently, particularly in the provinces of Nangahar and Kunar. Last August, the group assaulted the main jail in Jalalabad, the capital of Nangahar, in an effort to totally free lots of their fans who had actually been caught by the Afghan army and police.Read more about the group here.CNNs Nikki Carvajal, Jim Sciutto and Tim Lister contributed reporting to this post.