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The Islamic State offshoot that Americans blame for Thursday's deadly suicide attacks outside the Kabul airport coalesced in eastern Afghanistan six years ago and rapidly grew into one of the more dangerous terror threats globally.
Despite years of military targeting by the U.S.-led coalition, the group known as Islamic State Khorasan has survived to press more assaults as the United States and other NATO partners withdraw from Afghanistan, and as the Taliban return to power.
President Joe Biden cited the threat of Islamic State group attacks in sticking with a Tuesday deadline for pulling U.S. forces out of Afghanistan. U.S. General Frank McKenzie told a Pentagon news conference that officials believe fighters with IS carried out Thursday's attacks, including a bomber believed to have slipped into the Afghan crowds outside airport gates controlled by U.S. service members.
The group has built a record of highly lethal attacks in the face of its own heavy losses. A look at a deadly group influencing the course of the Kabul airlifts and U.S. actions:
What is Islamic State Khorasan?
The Islamic State's Central Asia affiliate sprang up in the months after the group's core fighters swept across Syria and Iraq, carving out a self-styled caliphate, or Islamic empire, in the summer of 2014. In Syria and Iraq, it took local and international forces five years of subsequent fighting to roll back the caliphate.
The Afghanistan affiliate takes its name from the Khorasan province, a region that covered much of Afghanistan, Iran and central Asia in the Middle Ages.
The group is also known as ISK, or ISIS K.
Who are the Islamic State Khorasan's fighters?
The group started as several hundred Pakistani Taliban fighters, who took refuge across the border in Afghanistan after military operations drove them out of their home country. Other, like-minded extremists joined them there, including disgruntled Afghan Taliban fighters unhappy with what they - unlike the West - saw as the Taliban's overly moderate and peaceful ways.
As the Taliban pursued peace talks with the United States in recent years, discontented Taliban increasingly moved to the more extremist IS, swelling its numbers. Most were frustrated that the Taliban were pursuing negotiations with the U.S. at a time when they thought the movement was on the march to a military win.
The group also has attracted a significant cadre from the Islamic Movement of Uzbekistan, from a neighboring country; fighters from Iran's only Sunni Muslim majority province; and members of the Turkistan Islamic Party comprising Uighurs from China's northeast.
Many were attracted to IS violent and extreme ideology, including promises of a caliphate to unite the Islamic world, a goal never espoused by the Taliban.
What makes them a leading threat?
While the Taliban have confined their struggle to Afghanistan, the IS group in Afghanistan and Pakistan has embraced the IS call for a worldwide jihad against non-Muslims.
The Center for International and Strategic Studies counts dozens of attacks that IS fighters have launched against civilians in Afghanistan and Pakistan, including minority Shiite Muslims, as well as hundreds of clashes with Afghan, Pakistani and U.S.-led coalition forces, since January 2017. Though the group has yet to conduct attacks against the U.S. homeland, the U.S. government believes it represents a chronic threat to U.S. and allied interests in South and Central Asia.
What is their role with the Taliban?
They are enemies. While intelligence officials believe al-Qaida fighters are integrated among the Taliban, the Taliban, by contrast, have waged major, coordinated offensives against the Islamic State group in Afghanistan. Taliban insurgents at times joined with both the U.S. and U.S.-backed Afghan government forces to rout IS from parts of Afghanistan's northeast.
A U.S. Defense Department official, speaking to The Associated Press on condition of anonymity because he was working covertly, said previously that the Trump administration had sought its 2020 withdrawal deal with the Taliban partly in hopes of joining forces with them against the IS affiliate. The administration saw that group as the real threat to the American homeland.
What is the risk now?
Even when the United States had combat troops, aircraft and armed drones stationed on the ground in Afghanistan to monitor and strike the Islamic State group, IS militants were able to keep up attacks despite suffering thousands of casualties, Amira Jadoon and Andrew Mines note in a report for West Point's Combating Terrorism Center.
The withdrawal is depriving the United States of its on-the-ground strike capacity in Afghanistan and threatens to weaken its ability to track the Islamic State group and its attack planning as well. Biden officials say IS is only one of many terror threats it is dealing with globally. They insist they can manage it with so-called over-the-horizon military and intelligence assets, based in Gulf states, on aircraft carriers, or other more distant sites.
One of the United States' greatest fears about withdrawing its combat forces after two decades is that Afghanistan under Taliban rule again becomes a magnet and base for extremists plotting attacks on the West.
That threat, U.S. national security adviser Jake Sullivan told CNN last weekend, was something "we're focused on, with every tool in our arsenal."