Australia's most senior recruiter for the "Islamic State" (ISIS) terrorist group in Syria, who was reportedly linked to an alleged plot to attack Anzac Day commemorations, has been killed, local media said Sunday.

News of Neil Prakash's death was posted on secure communications app Telegram, Melbourne's Herald Sun reported, citing an ISIS member.

"It was posted on Telegram," the member, who was not named, told the newspaper. "I did not know him, but I heard." The newspaper said there were no details about how, when and where Prakash, who left Australia in 2013, was killed.