Iraq crisis: Australian national fighting for Isis in Syria tweets photograph of son holding up severed head and writes ‘that’s my boy’

An Australian man fighting for the Isis militant group has reportedly posted a picture online showing his young son holding the severed head of a Syrian soldier, with the caption: “That’s my boy.”

The image has been condemned by the Australian Prime Minister, Tony Abbott, who said it provides further evidence of “just how barbaric” the Islamist organisation is.

It comes after the Iraqi government said “striking evidence” had been obtained that Isis had murdered at least 500 of the Yazidi ethnic minority, including burying women and children alive.

According to The Australian, the photograph is of convicted terrorist Khaled Sharrouf’s son, who has not been named but was raised in Sydney and appears to be under the age of 10.

The newspaper said it was posted on Twitter by the boy’s proud father, and that Sharrouf posted beneath the image that it was taken in the northern Syrian city of Raqqa – the “capital” of Isis’s self declared new Islamic Caliphate.