Mass killing at Borderline Bar & Grill in Thousand Oaks
People respond on social media after a gunman's rampage claimed the lives of 11 victims and a sheriff's sergeant late Wednesday in Thousand Oaks in a mass shooting that also left the gunman dead. The gunman has been identified as Ian David Long, 28, of Newbury Park. The Ventura County Sheriff's Office said he'd had past encounters with authorities, including being involved in a minor traffic collision and being a battery victim at a bar. Sheriff Geoff Dean said the gunman used a Glock 21 .45-caliber handgun.