An excerpt from Laura Bush's biography about that horrific day... Read it and you will see that the Secret Service took action as soon as the Pentagon was hit. They did not know what was going on but decided discretion was the better part of valor and dealing with the unkown is easier when you reduce the variables involved.
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As we walked out of the briefing room, the cell phone of my advance man, John Meyers, rang. A friend told him that CNN was reporting that an airplane had crashed into the Pentagon. Within minutes, the order would be given to evacuate the White House and the Capitol.
I walked back to Senator Kennedy’s office and then began moving quickly toward the stairs, to reach my car to return to the White House. Suddenly, the lead Secret Service agent turned to me and my staff and said that we needed to head to the basement immediately. We took off at a run; Judd Gregg suggested his private office, which was in the lower level and was an interior room. The Secret Service then told John that they were waiting for an Emergency Response Team to reach the Capitol. The team would take me, but my staff would be left behind. Overhearing the conversation, I turned back and said, “No, everyone is coming.” We entered Judd’s office, where I tried to call Barbara and Jenna, and Judd tried to call his daughter, who was in New York. Then we sat and talked quietly about our families and our worries for them, and the overwhelming shock we both felt.
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..Sometime after 10:00 a.m., when the entire Capitol was being emptied, when White House staffers had fled barefoot and sobbing through the heavy iron gates with Secret Service agents shouting at them to “Run, run!” my agents collected me. They now included an additional Secret Service detail and an Emergency Response Team, dressed in black tactical clothing like a SWAT force and moving with guns drawn. As we raced through the dim hallways of the Russell Building, past panicked staffers emptying from their offices, the ERT team shouted “GET BACK” and covered my every move with their guns. We reached the underground entrance; the doors on the motorcade slammed shut, and we sped off. The Secret Service had decided to take me temporarily to their headquarters, located in a nondescript federal office building a few blocks from the White House. Following the Oklahoma City bombing, their offices had been reinforced to survive a large-scale blast. Outside our convoy windows, the city streets were clogged with people evacuating their workplaces and trying to reach their own homes.
By the time I had reached my motorcade, Flight 93 had crashed in a Pennsylvania field and the west side of the Pentagon had begun to collapse. Judd Gregg walked alone to the underground Senate parking garage and retrieved his car, the last one left there. He pulled out of the garage and headed home, across the Fourteenth Street Bridge and past the Pentagon, thick with smoke and flame.
In the intervening years, Judd and I, and many others, were left to contemplate what if Flight 93 had not been forced down by its passengers into an empty field; what if, shortly after 10:00 a.m., it had reached the Capitol Dome?