A MAN has been arrested after reports of a terrifying knife spree in Sydney this morning.
At least one woman was injured after the attack unfolded on the streets of the Australian city this morning.
Footage showed bystanders bravely stopped the suspect, with one man seen following the apparent knifeman with a chair.
Witnesses then appear to apprehend the suspect – pinning him down under a chair and putting a milk crate on his heard.
It sparked a major police response around the area of King St and Clarence St in the city’s centre.
A witness told 2GB Radio that he saw the terrifying incident unfold.
The Uber driver said: “Next thing I see this guy jumping over the car, over the bonnet… he had a knife in his hand.
“He had a bit of blood on his shirt.
“There were police, people with their phone out, there were [firefighters] trying to contain him.”
First reports began emerging at around 2pm local time (5am BST) – with terrified passersby taking to social media.
Photos and videos appearing on Twitter showed a heavy police and emergency response.
A clip appeared to show a suspect standing on a roof brandishing a large knife – while another showed a suspect being arrested.
A spokeswoman for NSW Police told 7NEWS.com.au confirmed the arrest, adding: “It is too early to determine whether there were any injuries.”
A witness who chased the man could be heard saying: “Do you know how many people you just stabbed, you dog?”
“You just stabbed a chick, mate, in broad daylight.”
One witness told the ABC he was walking towards Wynyard Park when a man came running around the corner “with a long knife”.
The witness said: “[He was] about three or four metres away from me, and then came about five or six other men chasing him.
“They were armed with crowbars and one man had an axe and another man … I think had a firefighting implement.
“My immediate impression was that it was a scene from a crime show being shot, but then that quickly turned out not to be the case and the man ran down the road towards the cafe where patrons there must have tripped him up and they then put a milk crate over his head.”
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New South Wales Police have advised motorists to avoid King Street.
They said: “Emergency services are on site, and traffic crews are responding.”