Barack Obama, Xi Jinping, David Cameron and 50 other world leaders are battling against the clock to protect the world from a “dirty bomb” attack by terrorists in the heart of a major financial centre.
Military officials briefing the leaders do not know exactly where the attack is going to be carried out and they have limited time to come up with a response to avoid mass destruction. Hundreds of thousands of people could die.
This might sound like the plot of a Hollywood action film.
In fact it is a “war games” scenario faced by the leaders this week when they took part in a role-playing exercise at a nuclear safety summit in The Hague.