What would happen if a nuclear bomb went off in a major city?

The world is living under the threat of nuclear war and a terrifying simulation reveals what would happen if a nuclear bomb went off in a major city.

As well as looking at the destruction, scientists used the computer model to work out how people would behave if the worst-case scenario struck.

In the dystopian-like version of The Sims, researchers simulated a nuke exploding in Washington DC.