It might be nice to include a reference to the procedures that people were supposed to follow.
It might also be informative to include a timeline of actions taken and the level of effectiveness or the impact on the situation.
Don't just discuss recommended improvements...discuss what worked to ensure people keep doing it.
Take pictures of people as they "respond" - this not only engages people in the report but also shows what is working or not working. As an example, when I worked in a steel company, we had a mass evacuation drill. The entire Engineering Department was "run over" by the (imaginary) fire trucks because of where they were standing. *lol* Okay, it made us all laugh but there was a serious message intended and they were drilled on where to properly meet.