Afghanistan: Who are Islamic State Khorasan Province militants?
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A local branch of the Islamic State group in Afghanistan has vowed to continue attacks now that Taliban militants are in control.
So who are these IS militants?
IS-K - Islamic State Khorasan Province - is the regional affiliate of the Islamic State group.
It is the most extreme and violent of all the jihadist militant groups in Afghanistan.
IS-K was set up in January 2015 at the height of IS's power in Iraq and Syria, before its self-declared caliphate was defeated and dismantled by a US-led coalition.
It recruits both Afghan and Pakistani jihadists, especially defecting members of the Afghan Taliban who don't see their own organisation as extreme enough.
"Khorasan" refers to a historical region covering parts of modern-day Afghanistan and Pakistan. The group initially included Pakistan until a separate Pakistan section was declared in May 2019.
How many members does IS-K have?
At its height the group numbered about 3,000 fighters.
However, it has suffered significant casualties in clashes with both the US and Afghan security forces, and also with the Taliban.
What attacks have IS-K carried out?
IS-K has targeted Afghan security forces, Afghan politicians and ministries, the Taliban, religious minorities, including Shia Muslims and Sikhs, US and Nato forces, and international agencies, including aid organisations.
IS-K have been blamed for some of the worst atrocities in recent years, targeting girls' schools, hospitals and even a maternity ward, where they reportedly shot dead pregnant women and nurses.
IS-K claimed responsibility for the deadly attack outside Kabul airport on 26 August
Unlike the Taliban, whose interest is confined to Afghanistan, IS-K are part of the global IS network that seeks to carry out attacks on Western, international and humanitarian targets wherever they can reach them.
Where are IS-K based?
IS-K are based in the eastern province of Nangarhar, close to drug and people-smuggling routes in and out of Pakistan.
While most of its activities have been in Nangahar and Kabul, it has also claimed attacks in the provinces of Kunar, Jowzjan, Paktia, Kunduz and Herat.
Are IS-K linked to the Taliban?
Peripherally yes, via a third party, the Haqqani network.
According to researchers, there are strong links between IS-K and the Haqqani network, which in turn is closely linked to the Taliban.
The man now in charge of security in Kabul is Khalil Haqqani who has had a $5m (£3.6m) bounty on his head.
Dr Sajjan Gohel from the Asia Pacific Foundation has been monitoring the militant networks in Afghanistan for years.
He says "several major attacks between 2019 and 2021 involved collaboration between IS-K, the Taliban's Haqqani network and other terror groups based in Pakistan".
When the Taliban took over in Kabul on 15 August, the group released large numbers of prisoners from Pul-e-Charki jail, reportedly including IS and al-Qaeda militants. These people are now at large.
Why IS-K presents a challenge to the Taliban
But IS-K have major differences with the Taliban, accusing them of abandoning Jihad and the battlefield in favour of a negotiated peace settlement hammered out in "posh hotels" in Doha, Qatar.
IS-K considers Taliban militants "apostates", making their killing lawful under their interpretation of Islamic law.
IS militants now represent a major security challenge for the incoming Taliban government, something the Taliban leadership shares in common with Western intelligence agencies.
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