According to police reports on the incident, around 30 shots were fired. At least four ambulances arrived on the scene to treat victims, according to the Ventura County Star.
Local media report that the police were called around 11:15 p.m. about the shooting at the Borderline Bar & Grill.
Eyewitnesses report that the gunman was throwing smoke grenades. Authorities urged the public to stay away from area.
Thousand Oaks was recently ranked one of the three safest cities in the US, according to Business Insider.