'Heartbreaking' 9/11 footage shows tragedy from rare angle viewers claim they've 'never seen' before
Users say the clip captures the confusion of the moment as a newscaster missed the second plane hitting the South Tower ...
'Younger generations will not know the emotions we felt as we watched the planes hit in real time', one expert said ...
The public can now view the only civilian video footage captured of the 9/11 Pentagon response.
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