On 23 December 2016, Melbourne was in full holiday mode when the news broke that Ahmed Mohamed, Abdullah Chaarani, Hamza Abbas, and ringleader Ibrahim Abbas, had been charged over a plot to attack at random in Federation Square, slaughtering people with machetes and detonating bombs strapped to their bodies. As a new holiday season approaches, experts have revealed just how worried Australians should be about future terror attacks on home soil.