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.
Attack on Sydney Harbour
"I-29"s floatplane made a reconnaissance flight over Sydney on 23 May. A secret radar unit set up in Iron Cove detected the flight, but authorities dismissed its report as a glitch, as there were no Allied aircraft operating over Sydney. The aircraft was damaged or destroyed on landing, although its two crew survived. They reported the presence of several capital ships, including two battleships or large cruisers, five other large warships, several minor war vessels and patrol boats, and prolific merchant shipping. The report, which the Allied FRUMEL signals intelligence network partially intercepted, resulted in the Japanese Navy selecting Sydney as the target. The three midget-carrying submarines rendezvoused with "I-29" and "I-21" approximately north-east of Sydney Heads, with all five submarines in position by 29 May.