The FBI has released a series of chilling photos of the aftermath of the 9/11 terror attacks for the first time.
The never-before-seen images show the headquarters of U.S. military in ruins, after Al-Qaeda terrorists flew an American Airlines plane into the building, killing 125 people inside and the 59 people on board.
The pictures, taken in the days following the atrocity, show emergency services battling huge fires, yawning holes in buildings and the tangled wreckage of the plane that smashed into the Pentagon.
Forensic specialists are pictured looking through the wreckage; the FBI has obscured their identities in the release of images.
One picture shows a twisted shard of metal bearing the American Airlines logo lying in the grass, torn from the highjacked plane upon impact.
In another, FBI workers pick through debris thrown into the street from the wrecked building.