US presidents display unity on 20th anniversary of 9/11

The United States and several European leaders commemorated the 20th anniversary of the 9/11 attacks with solemn and moving tributes on Saturday.

To mark this sombre occasion, President Joe Biden went on a memorial tour of the three plane crash sites where thousands of lives were lost.

Biden is the fourth president to console the nation on the anniversary of that dark day, one that has shaped many of the most consequential domestic and foreign policy decisions made by the chief executives over the past two decades.