A clock, frozen at the time of impact, inside the Pentagon

The clock remains frozen in time at just after 9.30am.

That's when the gang of Al-Qaeda hijackers plunged American Airlines flight 77 into the Pentagon killing all 64 people on board and 125 in the building.

America will never forget Tuesday, September 11, 2001, when a series of coordinated terror attacks left nearly 3,000 dead and changed the world forever.

This year the US marks 17 years since the atrocities.

The Department of Defence released an astonishing set of rarely-seen images last year to mark the anniversary.

The aftermath in Washington of the terrorist attack on the Pentagon

They include candid pictures of then-President George Bush as they horrific events unfolded:

President George W. Bush turns around to watch television coverage of the attacks on the World Trade Centre
New York National Guard soldiers from the 69th Infantry Division and New York City firefighters band together to remove rubble Photo: New York National Guard

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