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At least one of the gunmen who killed 15 people in Sunday's Bondi Beach terrorist attack was known to authorities as a follower of a notorious Sydney pro-Islamic State cleric, the ABC can reveal.

Australia's domestic intelligence agency, ASIO, examined one of the Bondi Beach gunmen six years ago for his close ties to a Sydney-based Islamic State terrorism cell, the ABC understands.

Australia's domestic intelligence agency, ASIO, examined one of the Bondi Beach gunmen six years ago for his close ties to a Sydney-based Islamic State terrorism cell, the ABC understands.