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.
2014 Sydney hostage crisis
An anonymous call was made to Australia's anti-terrorism hotline 48 hours before the siege, raising concerns about the content of Monis' website. On his website, Monis had pledged allegiance to "the caliph of the Muslims", believed to be referring to Islamic State leader Abu Bakr al-Baghdadi, and denounced moderate Islam. It has been reported that the Australian Security Intelligence Organisation followed up on the call by reviewing the website and Monis' posts on social media but found nothing to indicate that he was likely to commit an act of violence.