The parents of Joel Cauchi, the Sydney shopping mall knife attacker, have conveyed their deep remorse and acknowledged his mental illness.

Cauchi's mental health issues were known to his family, who had previously reported them and now express sympathy for the victims.

Police are investigating the motive behind Cauchi's attack, which appeared to specifically target women.

The Australian Prime Minister has called for a comprehensive investigation and expressed concern for the victims, including a nine-month-old baby who was injured.

A national day of mourning was declared, with flags at half-staff, and plans for a memorial and independent inquiry have been announced.

The Prime Minister commended the police inspector whose bravery ended the attack, which resulted in six fatalities.

The incident underscores the critical need for better mental health support and resources.