Pentagon prepared for ‘mass casualty’ attack at Kabul Airport hours before explosion

Just 24 hours before a suicide bomber detonated an explosive outside Hamid Karzai International Airport, senior military leaders gathered for the Pentagon’s daily morning update on the deteriorating situation in Afghanistan.

Speaking from a secure video conference room on the third floor of the Pentagon at 8 a.m. Wednesday — or 4:30 p.m. in Kabul — Defense Secretary Lloyd Austin instructed more than a dozen of the department’s top leaders around the world to make preparations for an imminent “mass casualty event,” according to classified detailed notes of the gathering shared with POLITICO.

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.

“I don’t believe people get the incredible amount of risk on the ground,” Austin said, according to the classified notes.

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.

In the week before the attack, President Joe Biden and top administration officials repeatedly spoke in public about the general threat ISIS posed to the airport. Biden even cited that threat as a reason not to extend the military mission beyond Aug. 31. The president warned this weekend that an additional ISIS attack was “highly likely.”