2014 Sydney hostage crisis
The 2014 Sydney hostage crisis, also known as the Sydney siege and Lindt Cafe siege, occurred on 15–16 December 2014 when a lone gunman, Man Haron Monis, held hostage ten customers and eight employees of a Lindt chocolate café located at Martin Place in Sydney, Australia. Police treated the event as a terrorist attack at the time, but Monis' motives were subsequently debated. However, the findings of the Coroner in 2017 deemed the event to be a terrorist attack.
Gangs in Australia
A further issue is the extent to which the gangs like the 5T are responsible for the violence and extortion that is occurring in the Sydney area. 
There are many media reports of 'Asian gangs' in Sydney engaging in violent robberies including 'home invasions',
Vietnamese syndicates have gained media attention again recently with a recent drug bust in Melbourne. Casino high roller, Thanh Hai Pham, and his wife were ring leaders of this syndicate and a total of 12 people were arrested in connection with this operation.