That's according to New South Wales police commissioner Nick Fuller.

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A man who allegedly stabbed a woman to death in Sydney’s central business district before attacking others on a busy city street with a butcher’s knife was arrested carrying information about terrorist attacks and extremist ideologies on a USB drive.
But police say the man did not have any known links to terror groups, and that he acted alone. The attacks are not being treated as a terrorist attack, the New South Wales police commissioner, Mick Fuller, said on Tuesday night.