Sorry, but I call bs on this blog: "Feel Free To Kill Protesters", who said this? The author doesn't point any reference to confirm this quote, and I could not find it nowhere else.
- http://g1.globo.com/sao-paulo/noticia/2013/06/apos-sugerir-m...
EDIT: You can see this in english here: http://frombrazil.blogfolha.uol.com.br/2013/06/14/fear-and-l... (search for "prosecutor")