The U.S. and its allies waged war for 20 years to try to defeat terrorists in Afghanistan. A double-suicide bombing demonstrated that they remain a threat. The nightmare that kept counterterrorism experts awake even before the Taliban returned to power is that Afghanistan would become fertile ground for terrorist groups, …

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 …