At ceremonies across the U.S. -- tearful memories of a day that changed the country and calls for a return to the unity the nation witnessed afterwards. In Pennsylvania, New York, and suburban Washington D.C. - survivors, and relatives of the victims, marked the 20th anniversary of the 9/11 attacks. 

CGTN’s Nathan King reports from the World Trade Center in New York.

Check out The China Report, our new weekly newsletter. Subscribe here!