18th anniv. of 9/11 attacks marked across U.S.

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Photo taken on Sept. 10, 2019 shows the Pepperdine Wave of Flags display at Pepperdine University in Malibu, the United States, on Sept. 11, 2019, to mourn the victims of the 9/11 terror attacks which happened 18 years ago. (Photo by Qian Weizhong/Xinhua)