For months, terrorism analysts warned that Islamic State-linked militants in Afghanistan would try to turn the Biden administration’s exit into a bloody spectacle. On Thursday in Kabul, those predictions were realized. ISIS-Khorasan, the Islamic State’s Afghanistan and Pakistan arm, issued a statement claiming responsibility for the suicide bombing attack that …

After taking control of Afghanistan, the Taliban have pledged to be a responsible member of the international community that doesn’t pose a threat to any country’s security. However, the Islamist movement’s victory in Afghanistan has elevated its most radical and violent branch, the Haqqani network. Having perpetrated some of the …

Two days before he was shot dead by the Taliban, Abu Omar Khorasani, a onetime leader of Islamic State in Afghanistan, sat slumped in a dingy Afghan prison interview room, waiting for his soon-to-be executioners. Mr. Khorasani saw the Taliban’s advance as a harbinger for change. For years both organizations …