(CNN)In the space of just a few years, an ISIS affiliate in Afghanistan has seized on the country’s instability to become one of the region’s most feared terror groups.

ISIS-K has claimed responsibility for the deadly bombing attacks outside Kabul airport on Thursday, which targeted a frantic Western evacuation operation and killed 13 US troops and more than 90 Afghans. The group provided no evidence to support the claim but US officials have said it was likely behind the atrocity.It was ISIS-K’s most globally consequential action to date and drew a promise of retribution from US President Joe Biden.But the group, known in full as ISIS-Khorasan, has been responsible for thousands of deaths since its 2015 formation.Its members operate in central Asia, and the group’s name comes from its terminology for the area that includes Afghanistan and Pakistan.Read MoreIn 2018 it was ranked the world’s fourth deadliest terror group, claiming more than 1,000 lives, mostly in Afghanistan, according to the Institute for Economics and Peace, which monitors global terrorism annually. Since then the group’s growth has been limited and its militants have fought the Taliban. But they have capitalized on uncertainty in Afghanistan in recent months to launch brutal attacks, and the impending withdrawal of troops by the United States threatens to give them a window in which to regain strength. The Kabul attack claimed dozens of lives, including 13 US troops and more than 60 Afghans.The Kabul attack claimed dozens of lives, including 13 US troops and more than 60 Afghans.The Kabul attack claimed dozens of lives, including 13 US troops and more than 60 Afghans.How was ISIS-K formed?The group is a branch of ISIS, the terror group that first emerged in Syria and Iraq and, at its peak, controlled a huge stretch of territory stretching from western Syria to the outskirts of the Iraqi capital of Baghdad. The original group had its self-declared caliphate ended by US-backed forces in recent years.But the connection between ISIS-K and its apparent parent group is not entirely clear; the affiliates share an ideology and tactics, but the depth of their relationship with regards to organization and command and control has never been entirely established. US intelligence officials previously told CNN that the ISIS-K membership includes “a small number of veteran jihadists from Syria and other foreign terrorist fighters,” saying that the US had identified 10 to 15 of their top operatives in Afghanistan. Its earliest members included Pakistani militants who emerged in Afghanistan’s Nangarhar province around a decade ago, many of whom had fled Pakistan and defected from other terror groups, according to the Center for Strategic and International Studies (CSIS). Counter-terrorism analysts estimate its strength now at around 1,500-2,000, but that number may soon grow. Some captured ISIS-K fighters were being held in prisons near Kabul, which the Taliban overran as their offensive accelerated. What attacks has the group been responsible for?According to UN figures, ISIS-K launched 77 attacks in the first four months of this year.The group has carried out some of the deadliest attacks on civilians in Afghanistan, with several mass casualty suicide bombings in the capital, Kabul. The group was particularly active during its peak around 2018. In July of that year, an ISIS-K suicide bomber killed 128 people at an election rally in Mastung, Pakistan, one of the bloodiest attacks anywhere in the world in 2018.According to a US State Department report, the group relied heavily on suicide bombings — the same tactic used in the Kabul airport blasts on Thursday.The report found that in 2018, the group conducted 15 attacks in public places and killed 393 people. They included a bombing that killed 68 at a large public demonstration in Nangarhar, Afghanistan, on the anniversary of the September 11, 2001 attacks.US presses on with evacuation from Afghanistan after deadly Kabul airport attackUS presses on with evacuation from Afghanistan after deadly Kabul airport attackUS presses on with evacuation from Afghanistan after deadly Kabul airport attackThe group declined in strength after the US targeted its fighters across the region. But in 2019, Gen. Joseph Votel, the commander of US Central Command, told reporters during a visit to Afghanistan that they still posed a major threat both in the region and abroad.And the Institute for Economics and Peace warned that despite the group’s decline, it was “believed to still have sleeper cells in cities such as Kabul and Jalalabad,” and its militants continued to pose a threat to the Taliban.The group has built up a presence in eastern Afghanistan in recent years, especially in the provinces of Nangahar and Kunar. Last August, the group attacked the main prison in Jalalabad, the capital of Nangahar, in an effort to free dozens of its supporters who had been captured by the Afghan army and police.This January, Afghanistan’s intelligence agency said it foiled an attempt by the group to assassinate a key US diplomat, Ross Wilson, in Kabul. And in June the group claimed responsibility for an attack on an international demining charity, the Halo Trust, that left 10 people dead and 16 others wounded.

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