UPDATE @ 3.30PM: Police say a man who went on a stabbing rampage in Sydney's CBD was acting alone but his motive remains unclear.
Police said the body of a 21-year-old woman was later discovered in a nearby fourth-floor apartment.
A police source told the ABC the dead woman appeared to have suffered stab wounds.
"The attacker is now in police custody following the fearless actions of those who were present at the scene and were able to. restrain him", he said.
Police said the investigation was "live and ongoing".More news: Body found in hunt for missing teen Nora Quoirin
NSW Police are asking the public to avoid the area, after a man with a machete was arrested while reportedly trying to stab members of the public.
He drove off later witnessing the men giving chase.
The injured woman, a 41-year-old who police said was stabbed in the back in a "random attack", remains in a stable condition in Sydney's St Vincent's Hospital.
"They were armed with crowbars and one man had an axe and another man, I think had a firefighting implement", David said.
Further footage shows members of the public restraining the man near Wynyard station, holding him down by using chairs across his body and a milk crate over his head.
An eye witness caught Ney jumping on a auto and yelling "Allahu Akbar" and "shoot me" after the fell off the moving vehicle.
"Those are significantly courageous people", New South Wales Police Superintendent Gavin Wood said at a press conference Tuesday.More news: Hong Kong Int'l Airport reopens, USA warns China not to intervene
A group of people manage to subdue the suspect with a milk crate and several chairs before police arrived.
"A short time later, members of the public detained the man before police attended and arrested him".
So we went down the escalator, ran out, and you could see all the public on this side of the road and we were like, 'Where is he?' "I thought it was a scene from a television crime show but that quickly turned out not to be the case".
"They moved through the city streets, the fireys were calling out to people to run away", Walker said.
We heard a massive commotion outside and I looked outside and I could hear a man chanting. The Guardian reported the man's pronunciation made him appear like not an Arabic speaker.
Images broadcast by Australian media showed the man jumping on the roof of a auto brandishing a knife shouting "Allahu Akbar" and "shoot me".
"Next thing I see this guy jumping over the vehicle, over the bonnet ... he had a knife in his hand", the man said.More news: Google brings fingerprint authentication to Google websites on Android
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