Phnom Penh Villagers in northwestern Cambodia unearthed what authorities say could be a mass grave from the Khmer Rouge era. The grave contains skulls and the bones of corpses,some with legs bound by rope. The discovery was made in the final week of July about 60 kilometers from Siem Reap. Authorities said on August 6 that villagers were excavating land in a forested area when they discovered about 20 skulls and partial skeletons. The bones were found at the site of a former Khmer Rouge prison, where hundreds were believed to have been killed.