Cambodian villagers lit memorial in frankincense stepped in Choeung Ek, filled with skulls of victims of the Khmer Rouge. "The Killing Fields" Choeung Ek are located on the outskirts of Phnom Penh. 20 May Day observed in Cambodia the casualties day. The radical communist group led by Pol Pot was in power in 1975-1979 when he worked. During this time, as a result of ideological and ethnice cleansing in the country died from 1.5 million to 2 million people - nearly a quarter of the population.