After the second WTC tower is hit, NBC News correspondent Jim Miklaszewski is heading down a hall inside the Pentagon when he runs into a Defense Department official. The official says he doesn’t yet know anything specific about the attack. But, he says, it is so coordinated that “[i]f I were you I would stay off the E-ring [the outermost corridor of the Pentagon] today, because we’re next.” According to Miklaszewski, the official had no specific information, “that was just his gut instinct.” [Gilbert et al., 2002, pp. 43]
9:39 a.m.-9:44 a.m. September 11, 2001: Media Reports Pentagon Explosion
Television news reports describe an explosion and fire occurring at the Pentagon, but do not specify that a plane hit it: 
Two seconds after 9:39 a.m., reporter Jim Miklaszewski states on NBC News: “I don’t want to alarm anybody right now, but apparently, there—it felt, just a few moments ago, like there was an explosion of some kind here at the Pentagon. We’re on the E-ring of the Pentagon. We have a window that faces out toward the Potomac, toward Kennedy Center. We haven’t been able to see or—or hear anything after the initial blast. I just stepped out in the hallway. Security guards were herding people out of the building, and I saw just a moment ago as I looked outside, a number of construction workers who have been working here, have taken flight. They’re running as far away from the building as they can right now. I—I hear no sirens going off in the building; I see no smoke, but the building shook for just a couple of seconds. The windows rattled and security personnel are doing what they can momentarily to clear this part of the building. Again, I have no idea whether it was part of the construction work, whether it was an accident or what is going on. We’re going to try to find those details and get them to you as soon as possible. But interestingly enough, one intelligence official here in the building said when he saw what appeared to be the coordinating attack on the World Trade Center, his advice was to stay away from the outside of the building today just in case.” [NBC, 9/11/2001] At 9:40, CNN coverage includes a banner stating, “Reports of fire at Pentagon.” [CNN, 9/11/2001] Three minutes later, CNN producer Chris Plant reports from the Pentagon: “It’s impossible for me to say… exactly what caused this. I did not hear an explosion but there is certainly a very, very significant fire in this enormous office building.” [CNN, 9/11/2001] At 9:42, ABC News reports smoke coming from somewhere behind the Old Executive Office Building, next to the White House. Two minutes later it reports a “fire confirmed at the Pentagon.” [ABC News, 9/11/2001] At 9:43, CBS News reports “smoke pouring out of the Pentagon,” but adds, “We don’t know whether this is the result of a bomb or whether it is yet another aircraft that has targeted a symbol of the United States’ power.” [CBS, 9/11/2001]
However, no media outlets record video footage of the Pentagon crash, and the cause of the explosion remains unknown for some minutes afterward. The Associated Press is apparently the first source to report that a plane hit the Pentagon (see 9:43 a.m.-9:53 a.m. September 11, 2001).
