During the meeting, Gen. Mark Milley, the chair of the Joint Chiefs of Staff, warned of “significant” intelligence indicating that the Islamic State’s Afghanistan affiliate, ISIS-K, was planning a “complex attack,” the notes quoted him as saying.

Commanders calling in from Kabul relayed that the Abbey Gate, where American citizens had been told to gather in order to gain entrance to the airport, was “highest risk,” and detailed their plans to protect the airport…

On a separate call at 4 that afternoon, or 12:30 a.m. on Thursday in Kabul, the commanders detailed a plan to close Abbey Gate by Thursday afternoon Kabul time. But the Americans decided to keep the gate open longer than they wanted in order to allow their British allies, who had accelerated their withdrawal timeline, to continue evacuating their personnel, based at the nearby Baron Hotel.

American troops were still processing entrants to the airport at Abbey Gate at roughly 6 p.m. in Kabul on Thursday when a suicide bomber detonated his explosive vest there, killing nearly 200 people, including 13 U.S. service members.