Based on a true event.
After I saw this movie, I studied a bit about this event and found out something that I can't believe. It said that this event was created by the U.S. That's a different story so without thinking about that, the movie was good. Most of the footages were real taken by people who were there when it happened.
You could see how serious situation that was.

In fact, innocent people died due to the explosions and the event that happened while finding the bombers. What if this was created...? It's horrible to even think.
Rest In Peace for the victims.