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The researchers conducted a investigation into on the skeletons found at Jebel Sahaba. The scientists said the injuries were as a result of such as arrows and spears. They were likely sustained during a of conflicts or battles over decades. The researchers believe conflicts arose as tribes competed for food and water that were in limited because of dramatic changes in climate 11,000 to 20,000 years ago. At this , ice covered a lot of the Northern Hemisphere. This caused flooding and major changes to the of farmland. A researcher said: "These changes were not gradual at all. People had to survive these changes, which were ."