Shooting reported at Jewish festival of Hanukkah in Australia

In a post on social media, police called it a "developing incident", urging people to avoid the area.

"Anyone at the scene should take shelter. Police are on scene and more information will be provided when it comes to hand," they said, according to Australian Broadcasting Corporation.

"We are still asking people in the area to take shelter until we can determine what is happening."

Emergency services are at the scene, including more than 25 resources made up of medical teams, ambulances, helicopters and special operations units. 

NSW Ambulance said they're treating multiple patients at the scene and have transported four to St Vincent’s Hospital, one to Royal Prince Alfred and one to St George.