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Cambodia had become part of the Vietnam battlefield. During the next four years, American B-52 bombers, using napalm and dart cluster-bombs, killed up to 750,000 Cambodians in their effort to destroy suspected North Vietnamese supply lines.
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Vietnamese soldiers were searching for an end to the border attacks by the Khmer Rouge and thus launched a full-scale attack to bring an end to it all.
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The city, Phnom Penh, fell and Pol Pot was deposed. The Vietnamese then began a puppet government of the Khmer Rouge defectors.
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73-year-old Pol Pot died of a heart attack following his arrest, before he could be brought to trial by an international tribunal for the events of war crime during the Cambodian Genocide of 1975-79.