US President Joe Biden has urged unity as his country prepares to remember the victims of the 11th September attacks.
In a video, Biden paid tribute to the 2,977 people who lost their lives.
Biden says they honour all those who risked and gave their lives in the minutes, hours, months and years afterwards, speaking of the emergency workers who responded to the attacks.
Biden is set to lead commemoration events and will visit the three attack sites with the first lady, Jill Biden.
There will also be six moments of silence to correspond with the times the two World Trade Center towers were struck and fell, and the moments the Pentagon was attacked and Flight 93 crashed.
[Source: BBC]
