https://en.wikipedia.org/wiki/2016_shooting_of_Dallas_police_officers
http://www.nytimes.com/2016/07/08/us/dallas-police-officers-killed.html?_r=0
https://www.google.ca/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=police%20shot%20in%20dallas%20tx
