2014 Sydney hostage crisis
After the siege began, a staged exclusion zone was established with thousands of people evacuated from nearby buildings, including from the floors above the café. The Sydney Opera House was evacuated after a suspicious package was found; however, reports were unconfirmed by police. The US Consulate General in Sydney, located in Martin Place, was also evacuated. Some Sydney schools were put in "white level lockout" due to the hostage situation, which meant that no school group was permitted to leave the school grounds.
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.