Dozens of young Australians are showing their support for fighters in Syria and Iraq by liking images, creating online groups and adopting the black-and-white flag used by a terrorist group on their social media pages.

The support coincides with the release of an online recruitment video featuring two Australians, one of whom is since believed to have been killed in the fighting.

A screen shot taken from Facebook.

Sources have told The Sun-Herald that one of the men is believed to be Zakaria Raad, who was with Islamic State of Iraq and the Levant (also known as ISIS) and preparing to go from Syria to Iraq. He was believed to have been killed in an ambush in Syria and was understood to be the same man who was involved in the whipping of a Muslim man as punishment under sharia.

Channel Ten last night reported the same connections.