'Much More Brutal': Who Are Islamic State-Khorasan (IS-K)?

The Islamic State-Khorasan (IS-K), which claimed responsibility for the deadly August 26 attacks outside Kabul airport, is far more brutal than the Taliban, according to RFE/RL's Radio Azadi Service Director Qadir Habib. He explains the history of the militant group, its rivalry with the Taliban, and what the security picture for Afghanistan may look like in the coming weeks.