I can answer you FOR A FACT that the networks (MSNBC and Fox primarily) did not believe strongly if at all that this was a terror attack. I was watching the aftermath of the first hit and was amazed that the anchors were acting like this was an accident (I mean, we all remember that the Empire State Building was hit by a WWII bomber in the fog). I was SCREAMING at the TV - the weather was CLEAR - airplanes don't hit WTC towers in the clear! It wasn't until the second impact that they figured it out.
ML/NJ