A woman’s body has been found in a building on Clarence Street in central Sydney after a major police operation shut down part of the CBD.

Police investigating the death say it is not yet clear if it is connected with an earlier knife attack and pursuit in the city.

The woman was found in a unit on Clarence Street with her throat slit, where it is assumed the attacker left, causing a scene in the CBD and stabbing another woman in the back.

Police and ambulance officers are still at the scene.

This finding comes after the man was placed under citizen’s arrest at around 2:00pm todaym sparking a major police operation.

The injured woman was taken to St Vincent’s hospital in a stable condition, and multiple stab bounds in her back.

Police and NSW Ambulance paramedics found the injured woman inside the Hotel CBD, on the corner of King and Clarence streets.

Video taken at the scene shows passers-by using chairs, a crowbar and a milk crate to apprehend the alleged offender, before he was arrested by authorities.

When the man fell he dropped a knife into the gutter.

“There was a fair bit of force being applied to him at the time,” one witness said.

NSW Police Superintendent Gavin Wood said the man had tried to stab the woman before trying to stab others.

“There has been, again, subsequent to that stabbing a number of attempted stabbings by the same offender and bearing in mind we have multiple crime scenes, we are in the infancy stage of this investigation,” he said.

Since the event, the man has been arrested and all threat has currently been suspended.

“The male offender was on his own and there was no other person complicit at this stage.”

The man has officially been taken to Day Street Police Station.

The events of today are expected to have significant impact on traffic and public transport this afternoon.