The entire city has been destroyed, a lot of casualties and everyone who didn't get the shelter on time, they were killed by the nuclear explosion due to the flash wave, heat wave and blast wave before the explosion. This may intense for some viewers.
This film is not as disturbing as it was when it was released, but still has a very dark and mature theme which could be upsetting.
A nuclear bomb destroys Kansas City. People and animals are incinerated by the blast on screen. Mass looting and anarchy erupts. Other themes including radiation sickness and there are also some dead bodies that can be seen on the streets following the attack.
During the nuclear missile attacks, mass populations are killed by the blast. When they are hit their bodies are turned into blackened "skeletal x-rays". This isn't terribly graphic (the special effects are a bit dated) but it may disturb younger viewers.
Two people are briefly shown on fire, including a character the audience was introduced to. Both scenes are short and not particularly graphic.
Most of the nuclear destruction portrayed in the movie - except the deaths - is seen through the use of old stock footage.
A little boy runs outside during the nuclear blast and is blinded when he looks directly into the mushroom cloud. Nothing graphic.
A farmer is shot to death by the leader of a starving mob.
Several charred and blackened dead bodies are seen throughout the movie in the aftermath of the attacks.
Many survivors are seen, late in the film, dying of radiation poisoning, losing their hair and becoming weakened by their condition.