Biden authorized the drone strike and it was ordered by Defense Secretary Lloyd Austin, a defense official said, speaking on condition of anonymity to provide details not yet publicly announced.

The airstrike was launched from beyond Afghanistan less than 48 hours after the devastating Kabul attack that killed 13 Americans and scores of Afghans with just days left in a final U.S. withdrawal after 20 years of war. U.S. Central Command provided few details; it said it believed its strike killed no civilians.

The speed with which the U.S. military retaliated reflected its close monitoring of IS and years of experience in targeting extremists in remote parts of the world. But it also shows the limits of U.S. power to eliminate extremist threats, which some believe will have more freedom of movement in Afghanistan now that the Taliban is in power.