Nuclear weapon

A nuclear weapon is a weapon which derives its destructive force from nuclear reactions of either nuclear fission or the more powerful fusion. As a result, even a nuclear weapon with a relatively small yield is significantly more powerful than the largest conventional explosives, and a single weapon can destroy or seriously disable an entire city.

Before Day 1, nuclear weapons have been used only twice, both during the closing days of World War II. The first event occurred on the morning of 6 August 1945, when the United States dropped a uranium gun-type device code-named "Little Boy" on the Japanese city of Hiroshima. The second event occurred three days later when a plutonium implosion-type device code-named "Fat Man" was dropped on the city of Nagasaki. The use of the weapons, which resulted in the immediate deaths of at least 200,000 individuals (mostly civilians) and about twice that number over time, was and remains controversial.

Day 2
The terrorists of Day 2, led by Syed Ali, attempted to detonate a nuclear weapon in Los Angeles. While the detonation could not be stopped, it was eventually detonated in the desert by George Mason.

24: The Game
In 24: The Game, Max and Peter Madsen attempt to take nuclear weapons out of a military base and out of the country via ports. They are eventually stopped by Jack Bauer.

Day 4
The final threat in Day 4 was a nuclear weapon launched from Iowa by Habib Marwan. It was shot down right before it could reach Los Angeles.