A 25-year-old Irish woman remains in a stable condition in hospital after a car was driven into crowds in Melbourne yesterday, Australian police said.
The driver of the car in the incident, which injured more than a dozen people, attributed his actions to the "treatment of Muslims", police said.
However, officers stressed no terrorist links had been found during their initial investigations.
They said 19 people were wounded, three of whom remain in a critical condition, after a car was driven at pedestrians outside Flinders Street station.
The area surrounding the major transport hub was busy with Christmas shoppers during the first week of the school holidays.
Police have said the suspect, reportedly named Saeed Noori, a 32-year-old Australian citizen of Afghan heritage, had a history of mental illness and drug abuse.
Nine of the victims were foreign nationals and among them was the Irish woman.
The Department of Foreign Affairs has said it is aware of the case and is providing consular assistance.
Two men from South Korea, aged 61 and 67, are in a critical condition, while a four-year-old South Korean boy, the youngest victim, is in a stable condition.
A Chinese national aged 24, an Indian national aged 45 and a Venezuelan national aged 40 - all men - also remain in hospital.
An Italian man aged 25 and a man from New Zealand aged 43 were taken to hospital but have since been discharged.
The oldest victim, an 83-year-old man from Melbourne, is also in a critical condition, police said.
The suspect was admitted to hospital in the wake of the incident but has now been discharged and is in custody awaiting questioning once "medically cleared".
Victoria Police acting commissioner Shane Patton said officers had spoken to him in hospital as investigators carried out search warrants and also spoke to his family on Thursday evening.
"During that (questioning) he made utterances, talked about dreams and voices but nonetheless did attribute his actions he said to the way that Muslim people are being treated, so based on that we haven't ruled anything out," he said.
"Obviously we've done search warrants last night and we haven't found anything at all to indicate his linkage or involvement with any type of extremism, with any terrorist organisation or anything of a terrorist nature.
"So given the mental illness background and everything we need to step carefully and the investigation is ongoing."
The suspect was known to the police, having been convicted of an assault in 2010, and is understand to have been on a mental health plan and receiving treatment.
Witnesses described seeing people "flying everywhere" as the car was driven at speed along Flinders Street at around 4.30pm local time
A 24-year-old man who was arrested after he was allegedly found with illegal items during the initial police operation was interviewed and released, with police confirming the two men were not linked.
