It's appearing they were all reading from a prepared script. I was reading something earlier... can't remember where now... anyway, it was an interesting theory that Flight 93 was supposed to crash into WTC 7. But since the passengers seized control of it and either crashed in to the ground or the military forced to shoot it down... well, WTC 7 was still filled with explosives so it had to be taken down regardless. Remember, WTC 7 was full of all kinds of interesting offices; CIA, FBI, Guiliani's command bunker... anyway, they had to take it down and the government sent out a message to all of the mainstream outlets that at a certain time it would be coming down. However, something happened that delayed it; perhaps it took longer to get the last remaining firefighters out. CNN and BBC didn't realize this and went ahead and read the original message, not realising the building was still standing tall and strong right behind them. I don't know... I thought it was an interesting point of view.