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Timeline: Australia's terror threat Timeline: Australia's terror threat
(7 days later)
Concern has been growing in Australia in recent months over the effect on domestic security of Australian nationals fighting with or sympathising with Islamist militant groups in Iraq and Syria. The BBC looks at how events - and related legislation - have developed.Concern has been growing in Australia in recent months over the effect on domestic security of Australian nationals fighting with or sympathising with Islamist militant groups in Iraq and Syria. The BBC looks at how events - and related legislation - have developed.
21 July, 2014: Officials say Australian suicide bomber behind Iraq blast; concern grows over the number of Australians fighting for Islamist militant groups in the Middle East and the effect of them and their supporters and sympathisers on domestic security.21 July, 2014: Officials say Australian suicide bomber behind Iraq blast; concern grows over the number of Australians fighting for Islamist militant groups in the Middle East and the effect of them and their supporters and sympathisers on domestic security.
5 Aug: New legislation aimed at preventing people going to fight with Islamist groups announced.5 Aug: New legislation aimed at preventing people going to fight with Islamist groups announced.
11 Aug: Image emerges of young son of Australian militant fighter holding severed head of Syrian soldier.11 Aug: Image emerges of young son of Australian militant fighter holding severed head of Syrian soldier.
27 Aug: New counter-terrorism units set up in airports to stop departing fighters.27 Aug: New counter-terrorism units set up in airports to stop departing fighters.
27 Aug: Director general of Australia's spy agency, David Irvine, says 15 Australian militants have died fighting in Iraq and Syria. One hundred or more people in Australia are "actively supporting" militant groups by recruiting new fighters and providing funds, he says.27 Aug: Director general of Australia's spy agency, David Irvine, says 15 Australian militants have died fighting in Iraq and Syria. One hundred or more people in Australia are "actively supporting" militant groups by recruiting new fighters and providing funds, he says.
10 Sep: Brisbane Islamic centre raided; two charged with terrorism offences.10 Sep: Brisbane Islamic centre raided; two charged with terrorism offences.
12 Sep: Australia raises terror threat level from medium to high, for the first time since the system was introduced in 2003.12 Sep: Australia raises terror threat level from medium to high, for the first time since the system was introduced in 2003.
14 Sep: Prime Minister Tony Abbott commits 600 troops to fight against Islamic State, as part of a multilateral effort.14 Sep: Prime Minister Tony Abbott commits 600 troops to fight against Islamic State, as part of a multilateral effort.
18 Sep: Australia carries out what it calls its biggest counter-terrorism raid; Mr Abbott later confirms this was linked to an alleged plot by Australia-based individuals to kill a randomly selected member of the public. The intelligence is reported to have come from an intercepted telephone call involving an Australian fighter with Islamic State (IS) in Syria.18 Sep: Australia carries out what it calls its biggest counter-terrorism raid; Mr Abbott later confirms this was linked to an alleged plot by Australia-based individuals to kill a randomly selected member of the public. The intelligence is reported to have come from an intercepted telephone call involving an Australian fighter with Islamic State (IS) in Syria.
23 Sep: A teenager described as a "known terror suspect" is shot dead after he stabs two police officers at a Melbourne police station.23 Sep: A teenager described as a "known terror suspect" is shot dead after he stabs two police officers at a Melbourne police station.
3 Oct: Australia approves air strikes against IS.3 Oct: Australia approves air strikes against IS.
8 Oct: Mr Abbott proposes ban on foreign "hate preachers".8 Oct: Mr Abbott proposes ban on foreign "hate preachers".
29 Oct: The government says it is trying to confirm reports that the most senior Australian member of IS, Mohammad Ali Baryalei, has been killed in Syria.29 Oct: The government says it is trying to confirm reports that the most senior Australian member of IS, Mohammad Ali Baryalei, has been killed in Syria.
30 Oct: Parliament completes approval of a security law that creates a new offence of "advocating terrorism" and seeks to ban Australians from travelling to certain conflict areas.30 Oct: Parliament completes approval of a security law that creates a new offence of "advocating terrorism" and seeks to ban Australians from travelling to certain conflict areas.
4 Dec: Australia bans its citizens from travelling to the Syrian province of Raqqa, stronghold of IS.4 Dec: Australia bans its citizens from travelling to the Syrian province of Raqqa, stronghold of IS.
15 Dec: Gunman Man Haron Monis, a self-styled cleric originally from Iran, takes 17 people hostage in a cafe in the centre of Sydney.15 Dec: Gunman Man Haron Monis, a self-styled cleric originally from Iran, takes 17 people hostage in a cafe in the centre of Sydney.
16 Dec: Monis and two hostages are killed after a 16-hour siege. His former lawyer describes him as "unhinged" but not a jihadist.16 Dec: Monis and two hostages are killed after a 16-hour siege. His former lawyer describes him as "unhinged" but not a jihadist.
24 Dec: Counter-terrorism police in Sydney arrest two men, charging one with possession of documents designed to facilitate a terrorist attack.24 Dec: Counter-terrorism police in Sydney arrest two men, charging one with possession of documents designed to facilitate a terrorist attack.
11 February, 2015: Police arrest and charge two men with planning to carry out an imminent attack, saying they seized a hunting knife, an IS flag and a video describing an attack.11 February, 2015: Police arrest and charge two men with planning to carry out an imminent attack, saying they seized a hunting knife, an IS flag and a video describing an attack.
23 Feb: PM Tony Abbott announces plans to toughen citizenship laws and clamp down on those inciting hatred.