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After being crushed under a mountain of rubble—250,000 tons of steel, concrete and furnishings—some of their bodies weren’t recovered until months later.

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About a mintue later, FDNY officals, realizing that the north tower might collapse soon as well, got on the radio and issued a command to all firefighters in the north towertelling them to evacuate… Without a sense of the impending peril they faced, firfighters inside the north tower who heard the command didnt uniformly respond and get out of the building as quick as they could.( SOURCE 2 )

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Climbing the stairs clad in heavy protective clothing and carrying equipment was a grueling task.:From Juan

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Ilene some firefighters didn’t even know that the south tower had fallen.

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The firefighters were tired from going up and down the stairs with very heavy equipment.

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Some firefighters were separated from there units

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Many fire fighter didn't hear the evacuation order and died

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all of the frameworks from the doors where bucked beacuse of the explosion

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Nobody was prepared for the fall of the second tower at 9:59

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“ the north tower began to collapse at 10:28 a.m”

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Dominic the fire fighters were very tired from running up the stairs

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Some units delayed their own evacuations to help civilians who were having trouble ge ing out, while others lingered to look for other re ghters so they could descend together. Others stopped to rest on the way down.

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Some firefighters didn’t hear the evacuation order.

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Some firefighters delayed their escape to help people who couldn’t get out or to find other firefighters to leave together.

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the north tower began to collapse at 10:28 a.m.

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At 9:59 a.m, the south tower disintegrated and collapsed into itself in 10 seconds.

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The firefighters got tired really quickly

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FDNY officials, realizing that the north tower might soon collapse as well, got on the radio and issued a command to all firefighters in the north tower, telling them to evacuate.

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After being crushed under a mountain of rubble—250,000 tons of steel, concrete and furnishings—some of their bodies weren’t recovered until months later.

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The south tower fell on itself in 10 seconds at exactly 9:59 am

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“Many who weren’t near windows didn’t even know that the south tower had collapsed.”

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There was no time to flee , and the collapse killed all the firefighters.

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Some units delayed their own evacuations to help civilians who were having trouble getting out,

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Firefighters became tired from the heavy equipment they had to carry.

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Climbing the stairs became difficult for firefighters because of heavy protective clothes and having to carry equipment.

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radio communication became difficult as they ascended higher inside the buildings, (source #2)

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Radio communication became difficult as firefighters ascended higher inside the buildings.