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People attend a vigil held to mourn for victims of Dayton shooting in Dayton of Ohio, the United States, Aug. 4, 2019. On Aug. 3, 2019, a 21-year-old white male opened fire at throngs of shoppers in a Walmart in El Paso, Texas, killing at least 22. Thirteen hours later, Connor Betts, a 24-year-old white male, opened fire in a popular bar district in Dayton, killing nine before being killed by the police. (Xinhua/Liu Jie)