“This is a tragedy that should never have occurred,” Mr Albanese said. “That young mother has shown the extraordinary spirit that mothers have.”

Ms Good died from her wounds in St Vincent’s Hospital, but her daughter was taken to Sydney Children’s Hospital and was “doing well” after hours of surgery, the family said in a statement on Sunday.

Cauchi also murdered Ms Young, 47, a mother-of-two and architect at Double Bay firm Georgina Wilson Associates and Ms Singleton, 25, a UTS communications graduate who worked at clothing retailer White Fox Boutique and is the daughter of Sydney advertising giant John Singleton and lawyer Julie Martin.

Ms Singleton, a graduate of the Kambala school in Sydney’s east, was shopping for makeup for her wedding to childhood sweetheart Ash Wildey, a NSW police officer, when she was murdered.

Sexual consent activist and former Kambala student Chanel Contos said Ms Singleton was “adored” by her community.

“Men’s mental health is a feminist issue. When they are hurt, they can hurt us. We will riot for you Dawn, and every other woman and person killed,” Ms Contos said. Ms Singleton had just bought her wedding dress last week, the Daily Telegraph reported.

Security guard Faraz Tahir, 30, who sought refuge in Australia only a year ago after fleeing persecution in his home country of Pakistan, was also killed. The Ahmadiyya Muslim Community of Australia paid tribute to the “cherished” member of the community “who tragically lost his life while serving the public during this attack”.

Police released the name of a fifth victim late on Sunday, Pikria Darchia, 55, originally from Georgia.

Police officer Amy Scott bravely pursued Cauchi and shot him dead within six minutes after he lunged at her with the blade on level five of the complex.

NSW Premier Chris Minns said the whole state would need to get behind the families of those affected by the tragedy as they went through “the inevitable grief associated with such a horrifying event”.

Ms Good returned from maternity leave a month ago to her job as an account executive at electronic signature and contract company Docusign, having previously worked as an osteopath in both Queensland and NSW.

“We are reeling from the terrible loss of Ashlee, a beautiful mother, daughter, sister, partner, friend, all round outstanding human and so much more,” her family said in a statement on Sunday. “We appreciate the well-wishes and thoughts of members of the Australian public who have expressed an outpouring of love for Ashlee and our baby girl.”

Ms Good was second of four children to Kerry Good, who played for VFL club North Melbourne from 1977 to 1983 and was director at the club during the 1990s when it won two premierships. North Melbourne players wore black armbands during their match on Sunday in tribute to the victims.

Ms Young graduated with an architecture degree at the University of NSW in 2001 before studying further at the Architectural Association School in London. She was also an active member of the Bronte Surf Life Saving Club.

“It is with profound sadness that we share the loss of member, Jade Young. “[Young’s] family are involved and much-loved members and contributors to the club, most notably in the nipper and cadet programs,” the club said.

The principal of Kambala School, Jane Danvers, paid tribute to Ms Singleton as a valued former student, in a message to parents on Sunday. She graduated in 2016.

“We extend our sincere condolences to her family and acknowledge that the loss of a family member from such a random act must be exceptionally hard to comprehend,” she wrote.

White Fox Boutique described Ms Singleton as a “sweet, kind-hearted person who had her whole life ahead of her”.

“We are truly heartbroken that over the weekend we lost not only an employee but someone special to us. We send our love and deepest condolences to the Singleton family and her friends,” it said.

Commissioner Webb hailed the “enormously courageous” actions of senior Inspector Scott and said she was doing well under the circumstances. “The actions of Inspector Amy Scott no doubt prevented the loss of additional lives.”

New Zealand leader Christopher Luxon said all New Zealanders were thinking of those affected, while UK Prime Minister Rishi Sunak said they were “in the thoughts and prayers of the British people”.

Pope Francis said he was deeply saddened by the “senseless tragedy” and offered prayers. King Charles added he and Queen Camilla were “utterly shocked” and “our hearts go out to the families and loved ones”.