Sensitive Historical Content
This page covers the Cambodian genocide—one of the 20th century's most devastating atrocities. The content is factual and necessary for understanding modern Cambodia. We present it with respect for the approximately 1.7–2 million victims and the survivors who continue to share their testimonies.
What was the Khmer Rouge and what happened?
The Khmer Rouge was a radical communist regime that ruled Cambodia from April 17, 1975 to January 7, 1979 under leader Pol Pot. Pursuing an ideology called 'Year Zero,' they evacuated all cities, abolished money and religion, executed intellectuals and minorities, and forced the population into collective farms. Approximately 1.7–2 million Cambodians—up to 25% of the population—died from execution, starvation, and forced labor. Vietnamese forces ended the regime in January 1979.
- April 17, 1975: Khmer Rouge captures Phnom Penh and empties the city within 48 hours
- ~1.7–2 million deaths from execution, starvation, disease, and forced labor
- S-21 (Tuol Sleng): 17,000 prisoners; only 12 survived
- January 7, 1979: Vietnamese forces liberate Phnom Penh
- ECCC tribunal convicted senior leaders of genocide in 2018
Rise to Power (1968–1975)
The Khmer Rouge (meaning "Red Khmer" in French) emerged from the rural communist resistance of the 1960s, drawing on peasant grievances against urbanization, inequality, and foreign interference. Many leaders, including Pol Pot and Ieng Sary, had studied in Paris where they encountered French communist theory and became radicalized.
The movement gained momentum from the chaos of the Vietnam War years. The 1970 US-backed coup against Prince Sihanouk destabilized Cambodia, and American bombing campaigns (1969–1973) that killed tens of thousands of civilians drove many rural Cambodians into the arms of the Khmer Rouge. By 1975, the movement had swelled from a few thousand guerrillas to a force of over 70,000.
On April 17, 1975—just two weeks before the fall of Saigon—Khmer Rouge forces entered Phnom Penh to crowds of cautious celebration. Within hours, the regime began emptying the city at gunpoint, claiming American bombing raids were imminent. Within 48 hours, a city of 2.5 million people was a ghost town.
Year Zero: The Ideology of Annihilation
The Khmer Rouge's guiding concept was "Year Zero"—the idea that Cambodian civilization would be completely erased and rebuilt from scratch as a self-sufficient agrarian utopia. Drawing on a toxic mixture of Maoism, Rousseauian idealism, and xenophobic nationalism, the regime decreed:
Cities emptied
All urban residents forcibly relocated to collective farms
Money abolished
Currency burned; the national bank blown up
Religion outlawed
Monks executed or defrocked; temples used as prisons or storage
Education eliminated
Schools closed; teachers, doctors, and intellectuals executed
Family bonds severed
Children separated from parents and indoctrinated as soldiers
Foreign contact banned
Cambodia sealed off from the world; foreign aid refused
The 'Base People' vs 'New People' Division
The regime classified citizens as "base people" (poor rural peasants considered ideologically pure) and "new people" (former city dwellers considered contaminated by capitalism and foreign influence). New people received smaller food rations, harsher working conditions, and were first targets for execution. Wearing glasses could mark someone as an intellectual and warrant death.
Key Figures of the Regime
The Khmer Rouge was led by a secretive inner circle known as the "Standing Committee" or "Angkar" (The Organization). For years, even ordinary Cambodians did not know who led them.
Pol Pot (Saloth Sar)
Architect of the Khmer Rouge ideology. Studied in Paris, became enamored with Maoist communism. Led Democratic Kampuchea as "Brother Number One." Died under house arrest before standing trial.
Nuon Chea
Chief ideologist and second-in-command. Convicted of genocide, crimes against humanity, and war crimes by the ECCC in 2018. Died in custody awaiting final appeal.
Ieng Sary
Co-founder of the Khmer Rouge and minister of foreign affairs. Died while on trial at the ECCC before a verdict was reached.
Khieu Samphan
Nominal head of state of Democratic Kampuchea. Convicted of genocide and crimes against humanity in 2018. His academic dissertation on Cambodia's economy influenced the regime's agrarian policies.
Duch (Kaing Guek Eav)
Ran the S-21 Tuol Sleng prison where an estimated 17,000 were tortured and killed. First Khmer Rouge official convicted by the ECCC (2010). Showed remorse and converted to Christianity.
The Scale of the Atrocities
Deaths occurred through multiple mechanisms: mass executions at sites like Choeung Ek using primitive weapons to save ammunition; starvation on collective farms where food quotas were impossible to meet; disease from lack of medicine; and exhaustion from forced labor on irrigation projects. Specific target groups included ethnic Vietnamese, Chinese, and Cham Muslims; Buddhist monks; former military and government personnel; and anyone deemed an "intellectual" (including those who wore glasses or spoke foreign languages).
The S-21 detention center in Phnom Penh became the regime's most feared institution. Prisoners underwent systematic torture until they confessed to being CIA or KGB agents, then named associates who were in turn arrested. The regime's paranoia meant it eventually turned on its own cadres—many Khmer Rouge soldiers and officials were themselves imprisoned and executed in the final years.
The Vietnamese Invasion and Aftermath (1979–1999)
Relations between Democratic Kampuchea and Vietnam deteriorated rapidly after 1975. The Khmer Rouge launched raids across the Vietnamese border, killing thousands of civilians. After failed diplomatic efforts, Vietnam launched a full-scale invasion on December 25, 1978. By January 7, 1979, Phnom Penh had fallen and the Khmer Rouge had fled to jungle sanctuaries along the Thai border.
The international community's response was deeply compromised. Cold War politics led the United States, China, and ASEAN to support the Khmer Rouge's continued occupation of Cambodia's UN seat until 1993—meaning the regime that had committed genocide retained international recognition even after its removal from power. Khmer Rouge forces continued guerrilla warfare until 1999, when the last faction surrendered.
Pol Pot died under house arrest in April 1998, never having faced trial. The 1991 Paris Peace Accords and 1993 UN-supervised elections finally ended the civil conflict and established the constitutional monarchy that governs Cambodia today.
Memorial Sites: How to Visit Respectfully
Cambodia's genocide memorial sites are among the most important historical sites in Southeast Asia. Visiting them is an act of witness that most Cambodians deeply appreciate. Below are the three primary sites open to visitors.
Tuol Sleng Genocide Museum (S-21)
Daily 8 AM – 5 PM
A former high school converted into the Khmer Rouge's most feared interrogation and detention center. Of the estimated 17,000 prisoners processed here, only 12 survived to liberation. The preserved cells, victim photographs, and survivors' paintings create an unflinching record of state terror.
Visitor tip: Hire an audio guide or local guide. Allow 2–3 hours. Many visitors find the experience emotionally overwhelming—plan a quiet afternoon afterward.
Choeung Ek Killing Fields
Daily 8 AM – 5:30 PM
The most visited of the 20,000+ mass grave sites across Cambodia. Prisoners were transported from S-21 and executed at night to save bullets. A memorial stupa contains 5,000+ skulls. Bone fragments still surface after heavy rains.
Visitor tip: The audio guide features survivor testimonies that are profoundly moving. Visit in the morning when the light is softer and crowds smaller.
Wat Thmei Memorial
Daily dawn–dusk
A stupa in the grounds of a functioning temple holds the bones and skulls of Khmer Rouge victims from the Siem Reap region. Far fewer visitors than Phnom Penh sites, offering a more contemplative experience.
Visitor tip: Dress respectfully. Combine with a morning Angkor visit. The monks welcome respectful conversation.
Visitor Etiquette at Genocide Sites
- Dress modestly — cover shoulders and knees
- Speak softly and silence mobile phones
- Photography is generally permitted but be sensitive to other visitors
- Do not remove any bone fragments, artifacts, or items from the grounds
- Many visitors find these visits emotionally intense — allow time to decompress afterward
- May 20 is Cambodia's annual Day of Remembrance — a particularly meaningful day to visit
The ECCC Tribunals: Seeking Justice
The Extraordinary Chambers in the Courts of Cambodia (ECCC) was established in 2006 through an agreement between the Cambodian government and the United Nations. Its mandate was to prosecute senior Khmer Rouge leaders most responsible for crimes committed between April 17, 1975 and January 6, 1979.
Duch convicted
Kaing Guek Eav (Duch), commandant of S-21, sentenced to life imprisonment for crimes against humanity and grave breaches of the Geneva Conventions.
Nuon Chea & Khieu Samphan convicted
Both convicted of genocide (against Vietnamese and Cham Muslims), crimes against humanity, and war crimes. Sentenced to life imprisonment.
ECCC completes mandate
The tribunal formally closed after 16 years of proceedings, having provided partial justice and an extensive historical record.
The ECCC was criticized for its slow pace (16 years, $330 million spent, only 3 convictions) and for political pressure from the Cambodian government to limit prosecutions. Yet its documentation of the genocide—through court testimony, evidence, and written judgments—constitutes an irreplaceable historical record. The convictions also formally established that what occurred in Cambodia meets the legal definition of genocide.
Recommended Books and Films
Understanding the Khmer Rouge is essential for any visitor to Cambodia. These works offer accessible and deeply human perspectives on the period.
First They Killed My Father (2017)
Dir. Angelina Jolie, based on Loung Ung's memoir
Shot entirely in Cambodia with a cast of non-professional Cambodian actors. Depicts the regime from the perspective of a child. Available on Netflix.
S-21: The Khmer Rouge Killing Machine (2003)
Dir. Rithy Panh
Filmmaker Rithy Panh, a survivor, brings former S-21 guards face to face with survivors. One of the most important documents of the genocide. Winner of numerous international awards.
First They Killed My Father (2000)
Loung Ung
Memoir of a general's daughter forced to become a child soldier. Visceral, personal account of survival. A landmark of genocide literature.
When the War Was Over (1986)
Elizabeth Becker
Journalist who was one of the last Western reporters inside Democratic Kampuchea. Authoritative historical account of the regime and its aftermath.
The Gate (2000)
François Bizot
French ethnologist captured by the Khmer Rouge before their takeover. Only Westerner known to have been held and released by Pol Pot's forces. Unique insider account.
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