Woman killed, another injured as knife-wielding man goes on stabbing spree in Sydney

A knife-wielding man yelling 'Allahu Akbar' and with a history of mental illness went on a stabbing spree in Sydney on Tuesday, killing one woman and injuring another before being pinned down by passersby with chairs and a milk crate.

The attacker, identified as 21-year-old Mert Ney, has been arrested, Australian police said, adding the incident that took place in the busy central business district was not classified as a terror act and the suspect is believed to have acted alone.

Australian TV channels showed the attacker running through the King Street with a large kitchen knife yelling 'Allahu Akbar' (God is Great).

The attacker, who was seen jumping on the bonnet and roof of a Mercedes, stabbed a 41-year-old woman passing on the street in the back before he was overpowered with chairs and a milk crate by onlookers, police said.

Paramedics found the woman with a stab wound taking refuge in a nearby hotel.

Later, police said they found the body of a 21-year-old woman, believed to have been an acquaintance of the detained suspect, inside an apartment near the crime site.

Officers confirmed that the death was linked to the ongoing investigation.

"All the information we have at hand would link these two crimes," New South Wales police commissioner Mick Fuller said.

In a statement, police said that the emergency services responded following reports that a man was walking along York Street armed with a knife.

Fuller said the attacker had no known links to terror organisations, but did have a thumb drive with details of mass-casualty white-supremacist attacks in the United States and New Zealand.

He said the accused "is by definition a lone actor. Information was found on him that would suggest he had some ideologies related to terrorism... but he has no apparent links to other terrorist organisations."