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What We Know About The Accused Sydney Stabber Mert Ney

More details have emerged about the man who allegedly killed one woman and later stabbed another during an alleged rampage in Sydney's CBD.

A picture of a quiet,'weird' man from Sydney's west with mental health issues and an apparent interest in mass crime has slowly come to the surface.

Mert Ney allegedly stabbed a 24-year-old woman to death before running through the streets of Sydney's CBD wielding a 30-centimetre butcher's knife.

Police confirmed on Wednesday the woman was found in a Clarence Street apartment that she was using for "business purposes". She was allegedly stabbed in the neck and was pronounced dead at the scene.

READ MORE: One Dead, One Injured In Sydney CBD Rampage

Police officers are seen outside of an apartment building on Clarence street during a police operation in Sydney. Photo: AAP Image/Dean Lewins.

During his alleged rampage, Ney allegedly stabbed a 41-year-old woman in the back -- she's now in a stable condition at St. Vincent's Hospital. He is also accused of injuring a number of other people and jumping onto vehicles in the busy city traffic.

It all ended when three young men used a combination of cafe chairs and a milk crate to pin Ney to the ground. Police then quickly arrested the 20-year-old.

Ney is yet to be charged and is under police guard at Royal Prince Alfred Hospital, where he underwent surgery for a laceration to his knee on Monday.

READ MORE: 'Hero' Bystanders Risk Lives To Stop CBD Stabber

The moment Ney was pinned to the ground. Photo: Twitter @johnnie_txt

Police said on Wednesday morning it's unclear when Ney will be medically fit to speak to police about Tuesday's alleged incident.

Since his alleged rampage, more details about the accused Sydney stabber and his life have surfaced.

Mental Illness Background

Police confirmed on Tuesday that Ney had a significant background of mental health issues and that he'd escaped from a mental health ward in the days before the alleged stabbing. The Daily Telegraph reports Ney was in the psychiatric ward at Blacktown Hospital and was receiving treatment for a drug overdose.

NSW Police Commissioner Mick Fuller told media on Tuesday that investigators will now be tasked with accessing not only Ney's activity in the last few days but also in the last six-12 months.

It's also believed Ney has a history of drug abuse.

Ideologies Related To Terrorism

Information relating to white supremacist attacks in the U.S. and the Christchurch mass shooting were found on Ney's phone and a USB he was carrying. Police seized the phone, the USB and the knife allegedly used by Ney to carry out the attack.

All three items are now undergoing forensic testing.

Police managed to arrest Ney. Photo: AAP.

Fuller confirmed on Tuesday that the stabbing is not considered a terror incident and that it's believed Ney acted alone.

READ MORE: 'Lone Actor' With No Terrorist Link Behind 'Terrifying Carnage' In Sydney CBD

"Information found on him would suggest he had some ideologies in relation to terrorism, but he has no links to terrorism. There is no current intelligence on him and he has no other apparent links to other terrorist organisations."

There are also some unconfirmed reports Ney yelled "Allahu Akbar" while he was on his alleged rampage.

Police Visit Ney's Family Home

Police executed two search warrants at properties in Blacktown and Marayong, where they seized additional electronic devices that will also undergo forensic testing.

Ney's family home is located Marayong in Sydney's west where he lives with his family. Neighbours and others that know Ney described him as a quiet person, who kept to himself and wasn't overly social.

Ney attended Blacktown Boys High School and Marayong Public School. A former peer from the school in Marayong told The Daily Telegraph he was a “weird” loner.

Ney has been described as a loner. Photo: AAP Photos.

While his home address is in Marayong, Ney has reportedly been homeless a number of times and is known to police for a string of minor offences. Most recently, he fronted Blacktown Local Court in June after he was found with knuckledusters.

Police Investigation In The CBD Continues

The police investigation into the alleged stabbing and Ney's history is still ongoing.

On Wednesday morning police established Strike Force Lalchere to investigate the alleged Sydney CBD stabbings. The strike force's inquires will be supported by the Terrorism Squad.

Police are urging any witnesses who have not yet spoken to police to come forward. Authorities are also appealing for any mobile, CCTV or dashcam vision to be handed to police as soon as possible.

The police operation in Sydney's CBD continued on Tuesday evening. Photo: AAP Photos.

Ney remains in hospital under police guard and is expected to be charged with a number of crimes at a later time.

If you need help in a crisis, call Lifeline on 13 11 14. For further information about depression contact Beyond Blue on 1300 22 4636 or talk to your GP, local health professional or someone you trust.

Contact Siobhan at skenna@networkten.com.au