1.   She dropped the phone and rushed to the window just in time to see the second tower explode in a colossal fireball.

2.   She had been standing at the blackboard and facing the Manhattan skyline when the towers first exploded into flames.

3.   Seconds later, the tower exploded, blown up by a bomb from the belly of a U.S. plane.

4.   The enemy tower explodes.

5.   While we watched, the other Trade Center tower exploded.