9/11 timeline: how events unfolded

This weekend marks 20 years since the deadliest terror attack in history

US President Donald Trump today attended a 9/11 commemoration in Shanksville, Pennsylvania, where the hijacked United Airlines flight 93 crashed on 11 September 2001.

A 93-foot monument - called the Tower of Voices - has been unveiled at the crash site, to honour the passengers who prevented the plane from reaching its target.

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