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Tourists are seen near the White House in Washington, D.C., the United States, Sept. 3, 2021. U.S. President Joe Biden on Friday signed an executive order directing his administration to review and release some documents related to the FBI's investigation into the Sept. 11, 2001 terrorist attacks. The order directs the Justice Department and other federal agencies to review documents and release declassified information over the next six months. (Xinhua/Liu Jie)