Three Australian women returning from Syrian detention camps were arrested on terrorism and slavery-related charges linked to their alleged involvement with the Islamic State group.

The women, along with nine children, arrived in Australia after spending years in Syria’s Roj Camp, where authorities say investigations into possible war crimes and extremist activities have been ongoing for over a decade.

Two women face charges connected to slavery offenses, while another is accused of being a member of a terrorist organization and illegally entering an ISIS-controlled region.

Experts noted that some women in the caliphate allegedly played active roles in violence and enforcing strict Islamic State rules, including abuses against Yazidi women, the AP has reported.

Child welfare groups are urging the government to focus on supporting the returning children, many of whom were born and raised in harsh camp conditions.