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.
HMAS Sydney (FFG 03)
In 1997, "Sydney" was one of several RAN vessels placed on standby following the outbreak of political disturbances in Papua New Guinea as part of the Sandline affair. No action was required by the Australian warships.