Police have said a crash which injured 14 people in Australia was a "deliberate act" but was not terror-related.
Witnesses have described "people flying everywhere" as a white car was driven at crowds outside Flinders Street station in Melbourne just after 4:30pm (5:30am GMT).
Police have now confirmed the suspected attacker had a history of mental abuse and this was not a terrorist attack.
“We understand that he is on a mental health plan and reciving treatment for a mental illness,” police were quoted by News.com.au as saying. “We’re working to clarify that.’
Officers said several people are in a critical condition, adding it was "early days" in the investigation and the motivation was unknown.
Commander Russell Barrett said: "Police arrived at the scene within minutes and arrested two men. At this stage we have 14 people injured and several are critical.
"Police and emergency service will remain on scene for the foreseeable future. The crime scene will be in place for a considerable amount of the time."
Images from the scene showed a number of people receiving medical attention, while a white Suzuki SUV appeared to have crashed to a stop.
Social media images appeared to show a young man in jeans and a T-shirt being arrested by three police officers on the steps of the station, although it was unclear if he had been in the car.
Sky News said the driver of the SUV was of Middle Eastern appearance and that he was wrestled to the ground and handcuffed following the crash.
It was the first week of school summer holidays in Victoria, and the area was busy with Christmas shoppers.
A woman called Sue told 3AW radio: "As it (the car) approached this intersection... it just mowed everybody down, people were flying everywhere."
A man who was working in a nearby shop and was at the scene before emergency services arrived told the Australian Associated Press: "There was no screaming, just people lying there."