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bar shooting

Updated at 10:30 a.m. ET

A gunman killed 12 people and injured several more at a country music bar in Ventura County, Calif., late Wednesday, police said. When the shooting started, the Borderline Bar & Grill in Thousand Oaks likely held hundreds of people, drawn by College Country Night.

The dead include Sgt. Ron Helus, a 29-year veteran of law enforcement who died at a nearby hospital, Ventura County Sheriff Geoff Dean told reporters early Thursday.