Under Pol Pot's leadership, and within days of overthrowing the government, the Khmer Rouge embarked on an organised mission: they ruthlessly imposed an extremist programme to reconstruct Cambodia (now under its Khmer name Kampuchea) on the communist model of Mao's China. The population must, they believed, be made to work as labourers in one huge federation of collective farms. Anyone in opposition - and all intellectuals and educated people were assumed to be - must be eliminated, together with all un-communist aspects of traditional Cambodian society.

With macabre bureaucratic precision the Kmer Rouge photographed their victims before torturing and killing them.

Tuol Sleng Genocide Museum in Phnom Penh, Cambodia exhibits hundreds of photographs of prisoners who were destroyed by the Khmer Rouge.

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A list of some of the many resources available on the Internet.