Details have emerged about the violent history of the gunman behind the Sydney siege.
Self-described cleric Man Haron Monis, 50, came to Australia from Iran.
Monis first came to the attention of NSW police when he authored spiteful letters to the family of dead Australian soldiers seven years ago.
Fairfax Media reports Monis has been involved in an ongoing legal battle over his conviction for penning the poisonous letters.
It is understood the siege followed an unsuccessful, last-ditch attempted in the High Court on Friday to have the charges overturned.
Read more about how the events of the Sydney siege unfolded here.
Last year, Monis was charged with being an accessory to the murder of his ex-wife Noleen Hayson Pal, who was stabbed and set alight outside a western Sydney unit.
Prime Minister Tony Abbott revealed more about Monis’ background in his press briefing this morning.
What we do know is that the perpetrator was well known to State and Commonwealth authorities. He had a long history of violent crime, infatuation with extremism and mental instability. We know that he sent offensive letters to the families of Australian soldiers killed in Afghanistan and was found guilty of offences related to this. We also know that he posted graphic extremist material online. As the siege unfolded yesterday, he sought to cloak his actions with the symbolism of the ISIL death cult.
Deputy Commissioner Catherine Burn elaborated on that in a press conference this morning. She said:
“He was well-known to us. This is a man who had serious history of criminal offences and a history of violence. This was a man that we do believe had some extremist views and we also believe that he was unstable. We will clearly have a look at all the things that we can find out about him so that we can determine what might have triggered anything.”