18th anniversary of 9/11 terrorist attacks marked at Pentagon, U.S.

Flowers and balloons are placed to mourn the victims of the 9/11 terror attacks at the National September 11 Memorial and Museum in New York, the United States, on Sept. 11, 2019. People paid their tributes here on Wednesday to mourn the victims of the 9/11 terror attacks which happened 18 years ago and claimed thousands of lives. (Xinhua/Qin Lang)