http://www.omaha.com/news/crime/police-say-officers-in-des-moines-area-killed-in-ambush/article_796897d6-a0e5-11e6-af5d-678b7c1cfaf7.htmlhttp://heavy.com/news/2016/11/scott-michael-greene-des-moines-urbandale-iowa-police-shooter-gunman-suspect-photos-pictures-facebook-motive-military-criminal-record/