MELBOURNE, Australia (AP) — Australian police are examining why a lone assailant who stabbed six people to death in a busy Sydney shopping mall and injured more than a dozen others targeted women while avoiding men, a police commissioner said on Monday.

Police shot and killed the homeless assailant, Joel Cauchi, during his knife attack in the Westfield Bondi Junction mall on Saturday near world-famous Bondi Beach.

Police have ruled out terrorism and said the 40-year-old had a history of mental illness.

New South Wales state Police Commissioner Karen Webb said detectives would question Cauchi’s family in a bid to determine his motive. CCTV footage from the mall showed Cauchi targeted women.

“The videos speak for themselves, don’t they? And that’s certainly a line of inquiry for us,” Webb told Australian Broadcasting Corp.

“It’s obvious to me, it’s obvious to detectives that that seems to be an area of interest: that the offender had focused on women and avoided the men,” Webb added.