Federal Bureau of Investigation (FBI) has released hitherto-unseen photos which show the aftermath of 9/11 attacks.
Some of the photos also show the parts of the American Airlines Flight 77 which had crashed into the building killing all 59 people on-board, including the five hijackers.
The 9/11 attacks had killed 2,977 Americans and 19 hijackers. The firefighters had to work for days before the fire caused by the attacks could be extinguished completely.
The 27 pictures revealed now capture the vast devastation Pentagon saw during 9/11.
The Pentagon was built in 1943 as the headquarters of the US Department of Defence. It was also referred to as ‘Ground Zero’ as many believed that the former Soviet Union would attack it.