In pictures: Bhopal - 20 years on
World's worst

During the early hours of 3 December 1984 the world's worst industrial accident unfolded in the Indian city of Bhopal.

Poisonous gas escaped from a chemical plant and killed 3,000 people, according to official estimates. Other estimates put the number at between 8,000 and 10,000.

Around 50,000 suffered permanent disabilities, and more died later.

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