A man who reportedly travelled to Syria to help bring the so-called ISIS brides to Australia has been arrested on an unrelated assault charge.

It is understood that the man travelled to Syria several months ago and attempted to help the woman and children return to Australia.

NewsCorp has reported that he was arrested on his arrival in Sydney on an unrelated assault charge, after he was on the same flight as Janai Safar, one of the so-called ISIS brides who landed in Sydney Airport on Thursday night.

NSW Police carThe man was reportedly on the same flight as one of the so-called ISIS brides. (Nine)

The 32-year-old woman remains in Silverwater women’s prison after being taken there at about 11pm, shortly after landing in Sydney.

Safar was in court yesterday via video link, applying for bail as her lawyer said that she suffered horrific conditions in Syria, likely suffering some form of PTSD.

However, the judge ruled that it was not exceptional circumstances, and bail was denied.

She is not expected to face court again until July.

So-called ISIS bride Janai Safar.Janai Safar. (Nine)

In Melbourne, a mother and daughter were also arrested and appeared in court briefly yesterday, where it is understood they are set to appear again on Monday to apply for bail.