How the 9/11 attacks unfolded minute-by-minute
Today marks 23 years on since the horror of 9/11 that resulted in the deaths of almost 3,000 people and injured hundreds of thousands more.
Minute-by-minute, this is how it unfolded.
At 8:46am, American Airlines Flight 11, travelling from Boston to Los Angeles, strikes the north tower of the World Trade Centre in New York City.