The darkness within Chris Harper-Mercer again consumed Roseburg as it emerged he had enrolled at the college and apparently planned not just to kill but to .<br>Authorities learn more about 20-year-old gunman, how quick his massacre was.<br>WARNING: GRAPHIC FOOTAGE Shocking new video footage of the Westgate mall attack shows gunmen casually shooting shoppers and taking a break for .<br>A clearer picture is emerging of the man behind the attack on Parliament Hill. Today, the RCMP released a video recorded by gunman Michael Zehaf-Bibeau .
