Three young men are now in custody, and at least two of them recently pledged allegiance to the Islamic State — specifically an affiliate group known as ISIS-K.
This isn’t the first time Islamic State-related groups have been tied to attacks in Europe — over 140 people were killed in an attack on a Moscow concert hall earlier this year, and an explosion at an Ariana Grande concert in 2017 killed 22 and injured more than a thousand.
So – what exactly is ISIS-K, and how should we think about their presence in Europe?
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