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Borderline Bar & Grill

Updated at 3:10 p.m. ET

A lone gunman carrying a .45-caliber pistol killed 12 people at a country music bar in Thousand Oaks, Calif., late Wednesday, authorities say. When the shooting started, the Borderline Bar & Grill likely held hundreds of people, drawn by the weekly "College Country Night."

The dead include Sgt. Ron Helus, a 29-year veteran of law enforcement who went into the nightclub within minutes of receiving an emergency call. As many as 15 people inside the bar were injured, and one person had a minor gunshot wound.