Australian media last week reported that two of the country's most wanted IS jihadists, Khaled Sharrouf and Mohamed Elomar, were believed killed in a drone strike in Syria.
But highly classified photographs of the Predator strike have only confirmed the death of Elomar, with no indications that Sharrouf also perished, The Sunday Telegraph reported.
"He's got nine lives," an unnamed source told the newspaper. "It was a split-second thing."
The Telegraph said the classified photos showed Elomar standing next to a vehicle which was part of a convoy of IS fighters in Syria.
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Another image taken moments later showed an explosion as the convoy was hit by a missile, with a third image showing the debris left by the strike.
"Our security and intelligence agencies are working to verify reports that Khaled Sharrouf survived a coalition air strike which is believed to have killed Mohamed Elomar," Foreign Affairs Minister Julie Bishop said Sunday.
In recent days the child's grandmother, Karen Nettleton, has pleaded for the boy, and his four siblings, to be brought home to Australia.
The children were taken to Syria by their mother, Tara Nettleton, after a holiday in Malaysia in 2014. One of the five, 13-year-old Zaynab, is thought to have married Elomar while in Syria earlier this year.
The Sun-Herald said the girl had sent a text message to her grandmother in which she wrote "my husband got hit by a drone yesterday and got killed".
But he has also warned that if Nettleton, who converted to Islam and married Sharrouf 10 years ago, returned home she would face "significant consequences", while not offering any help for her to do so.