In Jiangyou, troops checked evacuated towns door to door to make sure no villagers returned, Xinhua said.
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On Tuesday a bridge collapsed in the nearby city of Jiangyou, leaving at least 12 people missing.
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The tremor, one of the strongest aftershocks since the May 12 earthquake, hit Jiangyou city in Sichuan, Xinhua said.
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The Fuzi samples from Jiangyou were placed into one category, while the Fuzi samples from Butuo and Yunnan were put into another category.
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Medical volunteers attend to a young earthquake victim at an evacuation center in Jiangyou, Sichuan Province, May 17, 2008.
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Jiangyou, population 850,000, is a city near the epicenter of the May 12 Sichuan quake which killed more than 69,000 people with thousands still missing.
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Jiangyou, population 850,000, is a city near the epicentre of the May 12 Sichuan quake which killed more than 69,000 people with thousands still missing.