From the outside, Tuol Svay Pray High School could be any high school in South East Asia. Five buildings face a grass courtyard and games areas, but these buildings on a dusty road near the outskirts of Phnom Penh have a dark and terrifying past. Shortly after seizing power, the Khmer Rouge converted the school into an interrogation centre and renamed it Security Office 21 (S-21). By the time that the Vietnamese drove the Khmer Rouge out in 1979, between 17 000 and 20 000 prisoners were held, tortured and interrogated there. The guards, interrogators and staff of S-21 were all peasant teenagers aged from 15 to 19 and under the control of Kang Kech Ieu, better known as Brother Duch who showed no mercy to prisoners or guards. In a meeting transcript Duch told an interrogator, "Remind him about the welfare of his wife and children; does he know that his wife and children have been detained; now that he is here does he know what has become of his wife?" Those that survived the interrogation were taken to the nearby Choeng Ek Killing Fields for execution. Here, they were forced to kneel at the edge of a pit whilst their executioners (also teenagers) struck them on the back of the neck with cart axels, hoes or sticks. Sometimes knives were used to slit their throats, but in order to save bullets only a very few were shot. The babies and younger children of the prisoners where swung by the ankles and their heads smashed against a large tree trunk. After the day’s executions, a poisonous chemical solution was spread over the bodies to hide the smell from peasants working in the nearby fields. Of the total number of prisoners who entered the facility, former guards claim that the actual figure is closer to 30 000 only 12 are known to have survived! In the intervening years, only Brother Duch has been successfully prosecuted, receiving a life sentence in 2012. Trials of other key members of the Khmer Rouge leadership are progressing slowly with many observers believing that political interference from the Cambodian Government is hampering justice being served.