Yeah, the FBI are pretty close to finding out who was the main person behind the terriost attacks.
Anyway, this terriost attack has been in plan for so many years. The people who hijacked the planes spent 1 year in pilot school so they knew how to fly the plane into the buliding.
They said on the news that all the planes didn't hit where they were supposed to. The two that hit the WTC were supposed to. The one that hit the Pentagon and the one that crashed in pensylvania didn't either. They suspect the Pentagon plane was supposed to hit the whitehouse and the Pensylvania plane was supposed to hit Air force 1, the persidents private jet.