After ISIS-K's Kabul Airport Attack, the U.S. Faces a New Terrorist Threat in Afghanistan

Just days away from pulling its last troops out of Afghanistan following 20 years of protracted war, the U.S. faces a new terrorist threat: Islamic State-Khorasan Province.

The group, abbreviated ISIS-K or ISKP, claimed responsibility for the coordinated bomb attack Thursday at the Abbey Gate of Kabul’s Hamid Karzai International Airport, where hundreds of Afghans and foreign citizens had been queuing up to get on the last evacuation flights out of the country. At least 90 people were killed, including 13 U.S. service members. It was the deadliest day for...