America marks the 20th anniversary of 9/11 Saturday with solemn ceremonies given added poignancy by the recent chaotic withdrawal of troops from Afghanistan and return to power of the Taliban.

US honours 9/11 dead on 20th anniversary of attacks

United States President Joe Biden called on the Americans to show unity as the country prepares to mark the 20th anniversary of the September 11, 2001, attacks that killed nearly 3,000 people.

US President Joe Biden calls for unity on the eve of 9/11 attacks

On September 11, 2001, two planes were flown into the famous twin towers of the World Trade Center in New York City. 19 terrorists associated with the Islamic extremist group al-Qaeda hijacked four airplanes and carried out suicide attacks against targets in the United States. The third plane hit the Pentagon just outside Washington, DC, and the fourth plane crashed in a field in Pennsylvania. Over 3,000 people were killed during the 9/11 terrorist attacks. The 9/11 attack triggered major US initiatives to combat terrorism.

What happened on September 11, 2001? | 9/11 attacks

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US honours 9/11 dead on 20th anniversary of attacks

US President Joe Biden calls for unity on the eve of 9/11 attacks

What happened on September 11, 2001? | 9/11 attacks