It was 9:37 a.m. on Sept. 11, 2001, al Qaeda terrorists who had hijacked American Airlines Flight 77 flew it into the Pentagon, killing 184 people.
Now, more than 15 years later, documentation of the horrific incident is still trickling out. The FBI recently released a batch of 27 previously unseen photos of the aftermath, documenting everything from first responders battling flames to interior and exterior damage to the building.
Of the 184 killed, 125 worked at the Pentagon. As ABC News notes, that number is substantially lower than it could have been: The plane collided with an area of the building that was undergoing renovations, so was relatively empty.
See some of the newly released photos below: