As with many investigations. See, for example, the 9/11 investigation: http://www.usatoday.com/story/news/nation/2015/03/25/911-fbi-investigation/70423820/ http

As with many investigations. See, for example, the 9/11 investigation: http://www.usatoday.com/story/news/nation/2015/03/25/911-fbi-investigation/70423820/ http://www.usatoday.com/story/news/nation/2015/03/25/911-fbi...