America Responds: Anatomy of a collapse
 
Pentagon
 
HOW IT HAPPENED AT THE PENTAGON
3.
Within minutes, the upper floors collapse into the 100-foot-wide gap, which extends most of the way through the office rings to the central courtyard. Fires burn through the night and the next day, hampering efforts to rescue survivors and recover bodies. Some 190 people are believed to be dead.

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GRAPHICS BY ROB CADY - USN&WR
REPORTING BY THOMAS HAYDEN - USN&WR
COORDINATED BY PHILIPPE MOULIER - USN&WR