USA Today report on these officers... (deceased)
http://www.usatoday.com/story/news/nation/2014/12/20/new-york-city-police-officers-shot/20698679/
The shooting comes at a time when police are being heavily criticized for their tactics following the chokehold death of Eric Garner in New York. Several officers have been assaulted at New York City protests during demonstrations that have largely been peaceful.
Protest are either peaceful or they aren't.
Mostly means nothing if there is destruction of property and or injuries or deaths.