The murder of a police accountant in Sydney on Friday by a boy of Iraqi-Kurdish descent, the latest in a spate of attacks by teenagers, shows the seeds of Islamist radicalism are sown early.
Oct.
2015
Farhad Khalil Mohammad Jabar, 15, shoots dead a civilian employee outside a police station in Sydney and is killed by officers at the scene.
May
2015
Police arrest a 17-year-old boy after finding three improvised explosive devices at his Melbourne home.
April
2015
Five teenagers are arrested in Melbourne in connection with an alleged plot to carry out a terror attack at an Anzac Day memorial event. A 14-year-old boy in northern England is later convicted for planning the attack.
Feb.
2015
Police arrest two Sydney men, Omar Al-Kutobi and Mohammad Kiad. Seize an Islamic State flag and a video describing an imminent attack.
Jan.
2015
The national terror threat for all police is raised from medium to high.
Dec.
2014
Self-styled Muslim cleric Man Haron Monis takes 18 people hostage at the Lindt cafş in Sydney. Two hostages are killed and Monis is shot by police after a 16-hour stand-off.
Oct.
2014
Security legislation is introduced that creates a new offence of “advocating terrorism” and bans travel to certain areas of conflict.
Sept.
2014
Numan Haider, 18, is shot dead by police after pulling a knife from his jacket and attacking officers outside a Melbourne police station.
Aug.
2014
New counter-terrorism units are installed at airports to stop those seeking to travel to fight with IS.