Nineteen Australian women and children linked to the Islamic State group are returning from Syrian detention camps, with flights arriving in Sydney and Melbourne.
Australian officials said some may face criminal charges, warning that anyone involved in crimes will face prosecution.
The government stressed it provided no assistance for the return and has long-standing security plans to monitor and manage returnees.
Earlier this month, several returning women were charged with terrorism and slavery-related offenses, including allegations involving a Yazidi slave and membership in a terrorist organization, the AP has reported.
Despite these returns, at least two Australians linked to IS remain in Syria, while Australia continues balancing security concerns with repatriation efforts.
