Police in NSW have said that they don’t expect any serious trouble, however, Parents should be aware of the threat to ensure the safety of wellbeing of their child.

Parents should be aware of their children's whereabouts or should take them trick or treating during Halloween night. It's encouraged to remain in familiar areas within your neighbourhood, stick to a planned route and always cross the road at designated lights and crossings.

The clown craze originated in America in 2016 and quickly gained traction in Australia, with a number of incidents being reported across the country.

Reference:
Brook, Mark "Chilling Killer Clown Warning Ahead Of Halloween Approaches ", Daily Mail Australia, 25 October 2018