Given a text, write a compressed version of it in a single sentence.
Q: Many civilians in the South Tower were initially unaware of what had happened in the other tower. Some believed an incident had occurred in their building; others were aware that a major explosion had occurred on the upper floors of the North Tower.
A:
Many civilians in the South Tower were unaware of what had happened in the other tower. Some believed an incident had occurred in their building others were aware that a major explosion.