- American Airlines jet that struck Pentagon was hijacked by Al Qaeda
- Nearly 3,000 people died in the attacks, most at World Trade Center
- 27 pictures from that day have been released by FBI
Twenty-seven pictures from that day depict the crushed walls, blazing fires and eviscerated interiors of the seat of the US Department of Defense.
The American Airlines jet that struck the Pentagon was one of four airliners hijacked by Al-Qaeda teams and used as weapons in the deadliest terror attack ever on US soil.
When the Pentagon was hit, two other airliners had already been flown into New York's World Trade Center; the fourth plane crashed in a field in Pennsylvania after passengers rose up against the hijackers.
One poignant shot shows an American flag tangled in concrete-and-rebar wreckage being cleared by a tractor.
In all, nearly 3,000 people died in the attacks, most of them at the World Trade Center.
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