The attacker who fatally stabbed six people at the busy shopping centre in Sydney's beach suburb of Bondi may have targeted women.
In the attack that took place on Saturday, five of the six people killed in a knife attack were women. The only male was a guard who tried to save a woman from attack.
The majority of the 12 injured were women.
The attacker has been identified as Joel Cauchi, a 40-year-old teacher turned male escort who was also said to be struggling with mental health issues.
"It's obvious to me, it's obvious to detectives that seems to be an area of interest that the offender focused on women and avoided the men," New South Wales State Police Commissioner Karen Webb told the Australian Broadcasting Corp.
"The videos speak for themselves, don't they? That's certainly a line for inquiry for us."
Webb said the police could not understand the attacker's mind.
"That's why it's important now that detectives spend so much time interviewing those who know him."
Cauchi, wearing shorts and an Australian national rugby league jersey, ran through the mall holding a knife. He was killed by inspector Amy Scott, who confronted him solo while he was on the rampage.
The last of Cauchi's six victims was identified on Monday as Yixuan Cheng, a young Chinese woman who was a student.
The other women killed were a designer, a volunteer surf lifesaver, the daughter of an entrepreneur, and a new mother whose wounded nine-month-old baby is in hospital.