World Trade Center, Collapse of The 09
World Trade Center, Collapse of The 09 : (4) Collapse of The North Tower: After the South Tower collapsed, NYPD helicopters relayed information about the deteriorating conditions of the North Tower. At 10: 20 am, the NYPD aviation unit reported that "the top of the tower might be leaning," and a minute later reported that the North Tower, "is buckling on the southwest corner and leaning to the south". At 10: 28 am, the aviation unit reported that "the roof is going to come down very shortly". The North Tower collapsed at 10: 28 am, after burning for 102 minutes. After the South Tower collapsed, FDNY commanders issued orders for firefighters in the North Tower to evacuate. Due to radio communications problems, firefighters inside the towers did not hear the evacuation order from their supervisors on the scene, and most were unaware that the other tower had collapsed. 343 firefighters died in the Twin Towers, as a result of the collapse of the buildings. No one was able to escape from above the impact zone in the North Tower after it was hit, as all stairwells and elevator shafts on those floors were destroyed or blocked. After the collapse, light dust reached as far as the Empire State Building, located 2. 93 miles (4. 72 km) away
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