Analysis of 20,000 mass grave sites by the DC-Cam Mapping Program and Yale University indicate at least 1,386,734 victims. Estimates of the total number of deaths resulting from Khmer Rouge policies,including disease and starvation,range from 1.7 to 2.5 million out of a population of around 8 million. In 1979,communist Vietnam invaded Democratic Kampuchea and toppled the Khmer Rouge regime.