ISIS-K

The Russian president described the violent shooting as "a bloody, barbaric terrorist act" after a group linked to the Islamic State claimed responsibility for the event.

After President Biden said another terrorist attack on the airport is "highly likely," the State Department warned Americans to leave the area.

Biden has pledged the U.S. will target the assets, leadership and facilities of ISIS-K, the Islamic State group's affiliate that has reportedly claimed responsibility for the terror attack.

A regional Islamic State affiliate is a major rival to the Taliban in Afghanistan. The U.S. says ISIS-K has long planned attacks on its personnel in the country.