Anthony Albanese has faced questions about his government's online safety reforms in the wake of Monday's brutal incident that has rendered independent MP Helen Haines a double amputee.
She remains in a critical condition.
Her staff were in the office just metres away at the time, Dr Haines' chief of staff Kaz Rourke said in a statement on Thursday.
"Our team is devastated by the attack on Helen Haines this week. Helen is adored by her team. She is a remarkable leader, a truly wonderful boss and someone we all care about deeply," she said.
"Most of us were in the office when the incident occurred and some of us were involved in Helen's immediate care, so this has been deeply traumatic for the team."
The widespread impact of the incident has called into question security measures both online and offline.
Police will allege Dr Haines was struck repeatedly by a four-wheel drive being driven by 43-year-old Brendan Nugent outside her Wangaratta office.
The motives of Nugent, who faces multiple charges, have not been established and he will return to court in February.
A 53-year-old man on Thursday faced court after he entered the Perth electorate office of state Labor minister Hannah Beazley on Wednesday and allegedly threatened staff while armed with nunchucks.
Social media and prolific artificial intelligence use have accelerated the time it takes to radicalise someone online, the Australian Federal Police has warned.
In many instances, it now happens in mere hours, compared to years or months.
But Mr Albanese said his government had tried - and failed - to have harmful content removed from online spaces.
"I acknowledge we haven't been able to do what we wanted to do," Mr Albanese conceded on ABC Radio, pointing to "a range of legislation" post-Bondi shooting that had not helped to halt online extremist content in the way he had hoped.
"I think they (social media companies) need to have a responsibility to take anything down like that. That is my view."
The federal government will try to pass its landmark digital duty of care legislation before the end of the year, but the bill has been deemed as political censorship by opponents and watered down.
Social media giant Meta has been hit with Australia's first-ever class action over alleged harm its platforms cause to children.
It was filed in the Federal Court earlier in October and claims Facebook and Instagram are addictive by design, exposing people to harmful content.
Dozens of politicians across all levels of government have called for a crackdown, saying they must be able to make public appearances safely.
Victorian Premier Ben Carroll said additional security resources would be put in place for the November 28 state election.
The state Labor leader did not say where those extra resources would be directed, but insisted authorities were collaborating closely.
Mr Albanese described Dr Haines' husband of 40 years, Phil, as "remarkable" in the way he delivered a statement about his wife, and encouraged others to look to him when considering how to conduct themselves.
"He spoke with such love about Helen's great characteristics of her heart, which is enormous, and her brain, which of course is also extraordinary," the prime minister said.
Mr Haines asked supporters to donate to Save the Children in his wife's honour.
Donations to the Helen Haines Support tab on the organisation's website had eclipsed $380,000 less than 24 hours after he spoke.
Her staff intend to reopen the office in coming days.
