The mass killings are widely regarded as part of a broad state-sponsored genocide (the Cambodian genocide).
Analysis of 20,000 mass grave sites by the DC-Cam Mapping Program and Yale University indicate at least 1,386,734 victims of execution. 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 1975 population of roughly 8 million. In 1979, Vietnam invaded Democratic Kampuchea and toppled the Khmer Rouge regime.
The Cambodian journalist Dith Pran coined the term "killing fields" after his escape from the regime.
The best known monument of the Killing Fields is at the village of Choeung Ek. Today, it is the site of a Buddhist memorial to the victims, and Tuol Sleng has a museum commemorating the genocide.