Multiple people have been shot after a gunman opened fire in a bar in Thousand Oaks, California.

Emergency services have arrived on the scene in response to the shooting, with at least one officer reported injured, according to local media.

Initial reports indicated that a man had opened fire with a semi-automatic gun at about 11.20pm.

Officers on the scene said around 30 shots had been fired and that victims would be at multiple locations as they fled, local media reported.

The suspect has been described as a Middle Eastern man in his early 20s wearing all black clothing and with a beard.

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(c) Sky News 2018: Multiple people shot as gunman opens fire in California bar