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More than 15 years after 9/11, the Federal Bureau of Investigation (FBI) has released never before seen photos of the Pentagon right after the attacks. On Sept. 11, 2001, al-Qaeda terrorists hijacked and flew the American Airlines flight 77 into the western side of the Pentagon, killing 189 people - 125 victims in the building, 59 on board the flights and the five perpetrators. Here is a look at some of the images.

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The Boeing 757 damaged the entire section killing the 7 civilians and 55 military personnel who were in the building.

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At that time, the building was undergoing renovation so many of the offices were unoccupied.

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The impact of the collision caused the outer ring of that wing of the building to collapse.

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Fire engulfed the entire section as firefighters handled the blaze.

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Hundreds of firefighters managed to finally control the blaze that had started when the plane crashed into the three outermost rings of the five rings.

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The section of the building that was struck housed the Naval Command Center.

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Rescue work began soon after with construction workers clearing the debris.

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The attack and crash sites was one of the largest crime scenes in FBI history.

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Clean-up work at the damaged section went through the night.

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A tent city of sorts came around the area as makeshift operations started investigating

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People in HAZMAT suits inspected the charred remains of the building.

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The ensuing investigation was code-named "PENTTBOM" and more than half of the FBI was involved in the investigation.

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The FBI Evidence Response Team (ERT) worked on their largest ever investigation trying to put the event together.

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They deployed forensic specialists whose identities were not released, to investigate the attacks.

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Canine teams were also called in to go through the building wreckage.

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Components of the Boeing 757 were found in the debris.

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What appears to be a part of the plane's fuselage was recovered.

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The rebuilding of the damaged section was named "Project Phoenix."

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A melted photocopier is seen in one of the offices.

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The area struck by the plane had blast resistant windows that stayed intact, but the resulting fire caused a lot of damage.

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The wing was also the only one with a sprinkler system. Once the firefighters were through, the scope of the damage was finally seen.

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A huge amount of debris was left to be cleared.

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Personnel made a makeshift memorial at the Pentagon following the attack.

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The rescue personnel raised the American flag on top of the building for the first time after the attack.

The FBI released an archive of photos showing the devastation at the Pentagon in the wake of the 9/11 terror attacks.