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On Sept. 11, 2001, the United States Pentagon was attacked in an act of war by terrorists.

The Pentagon was hit one hour after two fuel-loaded jetliners were hijacked and flown into the World Trade Center Towers in New York City.

At 9:45 a.m., American Airlines Flight 77, a Boeing 757 loaded with 64 souls and 10,000 gallons of jet fuel, dove and crashed into the west side of the Pentagon.

The impact of the crash penetrated four of the five rings of the Pentagon near the helicopter landing area:

Here’s a closer look at some rare photographs released by the Pentagon:

Air Force photo by Tech. Sgt. Cedric H. Rudisill/Pentagon

The heartbeat of the nation’s military burned for hours in a “devasting inferno”:

Navy photo by Petty Officer 2nd Class Robert Houlihan/Pentagon

This is what it looked like inside:

Air Force photo by Staff Sgt. Larry A. Simmons/Pentagon[/caption]
Sadly, 125 people were killed in the Pentagon. President George W. Bush visited the site in the days after 9/11:

In a short time, rescue workers unfurled an American flag over the damaged building:

And this is what the Pentagon looked like on 9/11/17:

Screengrab/Twitter

President Donald Trump and First Lady Melania paid honor to those at the Pentagon on Monday:

Andrew Harrer-Pool/Getty Images

And they prayed for the souls lost there on that day:

Andrew Harrer-Pool/Getty Images

Since the attacks of 9/11/01, the Pentagon brass has made sure that a flag is unfurled on the side of the building in honor of those who died that day and those who fought relentlessly to find the terrorists:

Alex Wong/Getty Images

See the live reporting of the attack from 16 years ago below: