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A new group of human remains has been discovered on the Plain of Jars in Laos. The remains are believed be about 2,500 years old. The Plain of Jars is in the central Lao province of Xieng Khouang. The area covers hundreds of kilometers on which there are thousands of ancient stone jars. They are grouped together at about 100 sites. The Plain of Jars has been a mystery to archaeologists, or scientists who study prehistoric cultures. A joint research team from Australia and Laos found the remains. Dougald O’Reilly teaches archaeology at Australian National University. He led the field work in Laos. He says some of the jars weigh up to 10 metric tons. Some have been moved eight to 10 kilometers and were set in groups, he says. Little is known about the people who made the jars or their purpose. The latest field work uncovered an ancient burial ground in an area known as Site 1, in Xieng Khouang Province. It has more than 300 jars, thin round stones and markers. The scientists say the ancient people had different ways of burying the dead. They include burials of whole bodies and burials of containers of bones. Scientists will test the remains. They may provide information on the culture of the people linked to the sites. O’Reilly said it is possible that the Lao sites may be linked to similar jar sites in India. The effort may soon provide answers to one of Southeast Asia’s greatest cultural mysteries.