Heroic passengers who died while foiling a terrorist hijacking of a passenger plane remembered 25 years on

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Memorials are being held in New York and beyond in memory of the 9/11 terrorist attacks, 25 years on.

At a memorial ceremony in New York City, the first of six moments of silence was held this morning, with US president Donald Trump in attendance.

A large crowd gathered solemnly just outside barricades surrounding the 9/11 Memorial, and in a nearby park, where hundreds stood in silence.

Others are paying tribute at a memorial at a field in Pennsylvania, where the United Airlines Flight 93 crash-landed amid the September 11 attacks - with passengers fighting back against the hijackers.

Read also: 'The horrors of 9/11 will never leave me': MI5 chief warns Britain now faces greater danger than 25 years ago

At 8.46am on 11 September 2001, 2,977 people were killed when hijackers crashed into the World Trade Center in New York City and the Pentagon in Virginia.

A fourth plane missed its target after passengers learned of the other hijackings, with those on board bravely attempting to overpower the terrorists, ultimately crashing the aircraft into a field in Pennsylvania.

It was the final plane to take off and the only flight taken over by extremists that did not reach its intended target.