A Qatar Airways plane carrying a group of women linked to ISIS fighters and their children has arrived at Melbourne's Tullamarine Airport.

The Melbourne plane landed about 5.30pm while another plane at Sydney's International Airport carrying another so-called Isis bride landed about 5.45pm. 

Shortly before the planes touched down a large group of supporters, believed to be family and friends, arrived at both Melbourne and Sydney airports. 

About a dozen large men dressed in black, some with body-worn cameras, were waiting in Melbourne, understood to be escorts for the women and children. 

The supporters remain unsure how many of the group will be let through customs following warnings from police that some would be charged. 

The cohort consists of four Australian women - grandmother Kawsar Abbas, 54, her two daughters Zahra Ahmad, 33, and former Sydney nursing student Zeinab Ahmed, 31, Janai Safar - and their nine children.

Kawsar and her family will land on Melbourne on Thursday on a Qatar Airway flight via Doha. She is accompanied by her brother, boxing coach Abraham Abbas.

It's understood Kawsar and one of her two adult daughters will be arrested upon arrival and charged over serious allegations made by two women from the Yazidi community in Syria, The Australian reports. 

Safar - who will touch down in Sydney with her son - is expected to be charged with offences related to entering or remaining in a declared terrorist area. 

The group of 13 left Al Roj camp two weeks ago. All of the women and children are Australian citizens and hold Australian passports.

It's understood 21 Australians still remain in the camp, in north-eastern Syria. 

Australian Federal Police Commissioner Krissy Barrett said evidence collected since 2015 had been used to determine whether the women breached Commonwealth laws, including 'humanity offences such as engaging in slave trading'. 

'Some individuals will be arrested and charged, some will face continued investigations when they arrive in Australia,' Ms Barrett said on Wednesday. 

If the case went to court it would mark the first time any Australian citizen had been prosecuted for the crimes under domestic law.

More to come...