Where was the video first posted?
I couldn't go to your link, it crashed me. LOL
I had heard something on the news about a shooting at the
Post Office.
There is also an article of interest about Pinal county, az.
I can't open either report.
http://news.google.com/news?q=shooting+at+post+office&hl=en&lr=&ie=UTF-8&client=googlet&sa=N&tab=wn