http://mediamatters.org/blog/2014/12/22/fox-news-double-standard-for-right-wing-cop-kil/201978
"As bullets flew, one of the shooters reportedly shouted that the "revolution" had begun. The killers then stripped the officers of their weapons and ammunition and badges, and covered them with cloth that featured the "Don't tread on me" Gadsden flag, which has recently been adopted as a symbol of the tea party movement."