Sydney stabbing: one woman killed and one injured in 'terrifying carnage' in CBD

Police say 21-year-old suspect from western Sydney was carrying information on extremist ideologies when arrested

• As it happened: man had history of mental illness, police say
• What we know so far about the Sydney CBD knife attack

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.