Sireners, who are usually part of “crews”, mount the sirens to cars or bikes.

A 10-year-old girl has been hailed a hero after she attempted to save her mum from being fatally stabbed in Melbourne's south-east.

Monique Lezsak's body was found by police in an Endeavour Hills home about 7.30am yesterday.

Sven Lindemann was taken to the Alfred Hospital under police guard with serious upper body injuries, while one of Lezsak's twins was taken to Monash Hospital with minor injuries.

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Flowers were laid at Lezsak's parents' home today, the place where she was allegedly stabbed and killed.

Lezsak's best friend, Jacqueline Schwarcz, said the family was completely devastated.

"She was so kind and lived for her children. Every single day, it was just about her kids and she made sure she gave them experience and fun," she told media today.

Both of her twin son and daughter were home at the time and Schwarcz said one of the girls was injured trying to save her mum.

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"She is definitely a hero in all of our eyes," she said.

"We are going to surround her and support her through this."

The 51-year-old partner, Lindemann, remains under police guard in hospital.

No charges have been laid, but investigations are continuing.

Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14.

If you or someone you know is impacted by sexual assault, domestic or family violence, call 1800RESPECT on 1800 737 732 or visit 1800RESPECT.org.au. In an emergency, call 000.

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Police have found a crocodile at the home of a man charged in the Northern Territory with aggravated assault.

Police said two men allegedly assaulted three people sleeping in a shelter in Katherine on October 10 last year.

A 32-year-old man was arrested in Acacia on Tuesday and police searched his home in Girraween.

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"A number of illegal items were seized including an unsecured firearm, sword fish rostrum and a live crocodile," police said.

The man has been charged with three counts of aggravated assault, possess/use firearm unlicensed, possess/use firearm without permit and ail to meet storage requirements.

He was bailed to appear in Darwin Local Court on June 13.

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A man accused of making death threats online has been ordered to stay away from former political staffer Brittany Higgins and her fiancé.

David William Wonnocott, 49, appeared in a northern NSW court on Wednesday for the first time since his April arrest over social media threats of violence.

One condition of his bail is not to be with or contact Higgins or her fiancé David Sharaz except through a lawyer.

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Wonnocott is charged with using a carriage service to threaten to kill on April 11, 2022 and using a carriage service to menace, harass or offend between July 2022 and February.

The Banora Point man is also facing a separate charge of using a carriage service to menace, harass or offend on January 9.

His bail conditions in relation to that charge state he cannot contact or approach NSW MP Alexander Greenwich except through a lawyer.

Wonnocott was arrested on the latest charge soon after midnight on February 25, the morning of the Sydney Mardi Gras.

He was released on bail with conditions including a ban on attending Mardi Gras or being in the Sydney CBD, and a 4pm to 11.30pm curfew that day.

Wonnocott has a criminal history relating mainly to intimidation and threats towards members of minority groups using social media, police said in court documents.

"His posts are hate related towards members of these groups and members of the public."

Police said Wonnocott's threats are considered real and taken seriously.

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"There is a serious threat that he may in fact try and carry out a threat of violence in the near future."

Police have records of Wonnocott's posts, device data and victim impact statements in relation to threats and intimidation.

"It is the police view that he would be in contact with far-right-wing thinking groups with radical views that practice and endorse violence towards members of specific minority groups," the documents read.

NSW Police said detectives began investigating in February "after receiving information about threats of violence made through a social media platform in relation to participants of a mass gathering".

"Detectives uncovered a total of 49 messages with similar threats or offensive content sent from a number of accounts, which were believed to be linked," police said.

"One of the accounts was also linked to messages sent on social media to a man in the ACT, allegedly threatening to kill the man, his partner, and their pet dog."

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The targets were not named.

Higgins has received a barrage of abuse on social media after going public with allegations that she was raped by a colleague at Parliament House in 2019 when she was working for a Liberal senator.

Wonnocott appeared in Tweed Heads Local Court where Magistrate Geoff Dunlevy said a plea of guilty had been entered in relation to the single charge relating to Greenwich.

That case is due for mention again in the same court on July 24, when Wonnocott – the sole carer of his elderly parents – does not have to appear if legally represented.

Outside court, Wonnocott said he did not know Higgins or Sharaz.

Asked what he was going to do in future, he replied with a smile: "behave".

In 2021, former Liberal Party staffer Bruce Lehrmann was charged with sexually assaulting Higgins and pleaded not guilty.

A trial in the ACT Supreme Court was derailed due to juror misconduct.

The charges against him were later dropped because of concerns about the impact a second trial would have on Higgins' mental health.

Lehrmann denies raping Higgins.

Support is available from the National Sexual Assault, Domestic Family Violence Counselling Service at 1800RESPECT (1800 737 732).

Readers seeking support can contact Lifeline on 13 11 14 or beyond blue on 1300 22 4636.

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