DEVELOPING: 12 People Killed in California Bar Shooting

Twelve lives were tragically cut short after a gunman opened fire inside a popular southern California bar.

The heinous attack also left more than 20 people hospitalized for wide-ranging injuries.

One of the victims killed includes a sheriff’s deputy who arrived first on scene at the bar shooting in Thousand Oaks. 

Right now investigators are trying to figure out why the shooter, who was killed during the mass shooting, opened fire.

Witnesses say the gunman, dressed in black, shot an unarmed security guard at the front door.

Police say 28-year-old Ian Long then set off a smoke device and fired multiple rounds into the bar, never speaking a word.

Hundreds of people fled, some breaking windows and jumping from the second floor to escape.

Sheriff’s Sergeant Ron Helus was the first to exchange fire with the gunman.

The 29-year veteran of the force died after he was shot multiple times.

President Trump offered his condolences to the victims of the tragedy in a series of tweets saying:

Stay with Northern Michigan’s News Leader for updates.