'We will hunt you down and make you pay': Biden

"We will not forgive, we will not forget. We will hunt you down and make you pay," Biden said in remarks at the White House.

Islamic State struck the crowded gates of Kabul airport in a suicide bomb attack on Thursday, killing scores of civilians and 12 U.S. troops, and throwing into mayhem the airlift of tens of thousands of afghans desperate to flee.

The U.S. death toll, announced General Frank McKenzie, head of U.S. Central Command, made it the deadliest single incident for American forces in Afghanistan in a decade and one of the deadliest of the entire 20-year war.

Afghan health officials were quoted as saying 60 civilians died, but it was not clear whether that was a complete count. Video uploaded by Afghan journalists showed dozens of bodies and wounded victims strewn around a canal on the edge of the airport. At least two blasts rocked the area, witnesses said.

Biden said U.S. evacuations would continue. He gave no indication of a change in next Tuesday's U.S. pullout target.

"I have also ordered my commanders to develop operational plans to strike ISIS-K assets, leadership and facilities. We will respond with force and precision at our time, at the place we choose and the moment of our choosing," Biden said.

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