Description & explanation of evidence found: Boston Marathon bombing

 A point-by-point explanation  of the evidence found at the site of the Boston Marathon bomb blast  (the  remnants and traces  of the explosive device) using video  aerially shot,  then zoomed in,  of the crime scene investigators at work,  is given here  by an NYPD bomb expert in this news video produced and uploaded by ABC News:

comments are welcome anytime EXCEPT those with more than 12 links or 12 URLs pasted. Tnx)

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