Australian authorities arrested three women who arrived at Sydney and Melbourne airports after flying back from Syria where they had allegedly supported fighters from the so-called "Islamic State" (IS) , police said. The women, aged 31, 32 and 53, are all Australian citizens. They have spent the last few years in refugee camps in Syria after the downfall of IS. Another woman who was travelling with the group was not arrested. According to reports, nine children were also among the groups flying back to Australia. Women welcomed by security and reporters Police said ahead of the arrivals that the women could be charged with "terrorism offences" after travelling to a banned area, as well as "crimes against humanity offences such as engaging in slave trading." The groups of returnees were greeted by black-clad security personnel as well as throngs of journalists.…