On the 16th anniversary of 9/11, the US government has released rare pictures that reveal the horror inside the building after it was hit by a American Airlines Flight 77.
A clock frozen in time at the moment the Pentagon was hit, melted telephones and offices reduced to twisted metal and ash show just a glimpse of the terror that workers faced.
The September 11th attacks left 2,996 people dead and more than 6,000 others wounded – including 184 at the Pentagon, as well as the five hijackers.
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A series of coordinated attacks saw terrorists fly into the Pentagon in Washington and the World Trade Centre in New York.
Passengers on board United Airlines Flight 93 managed to overpower hijackers before they reached their target, bringing the plane to a crash landing in Shanksville, Pennsylvania, killing everyone on board.
President Donald Trump is due to observe a moment of silence today at the time the first airplane hit.