-There are constant repeated pictures/videos of the WTC collapse and planes' impacts, this is almost non-stop and it's repeated many many times from different angles in great detail.
-In a couple of scenes we see several people jump from the ill-fated buildings, some times in detail but we never see anyone hitting the ground.
-We see and hear several tremors as glass breaks and shatters, we see many cars that are broken by explosives/debris.
-We see several scenes of people running away from Ground Zero, and constant threat, as debris and dust follow them and fill the streets of New York City.
-We see several scenes of people next to the WTC as they collapse or are impacted, we don't know who dies and who survives but it's implied that several people whom we've seen throughout the videos are killed.
-Most of the scenes that happen are emotionally distressing.
*In an edition that spans 20 extra minutes we see several still-images of a man with a bloody face and we are told that he was attacked, this version also contains several references of violence and ill-actions including rape.