A woman was taken to hospital after being stabbed in downtown Sydney on Tuesday in what appeared to be an unprovoked attack by a man who was restrained by members of the public and then taken into custody, police said.
The unidentified man had also tried unsuccessfully to stab other people, police said, in an incident that brought the central business district in Australia's largest city to a standstill in the early afternoon.
"We have a female person with a stab wound to the back currently being treated by paramedics and is en route to a Sydney hospital," Police Superintendent Gavin Wood told reporters in Sydney.
He said the woman's injuries were not life-threatening.
Wood also said the attack appeared to be unprovoked but police were keeping an open mind.
Police were also investigating whether the body of a woman found inside an apartment near where the stabbing took place was linked to the incident, a New South Wales state police spokeswoman said.
Video images on Twitter showed a young man running across a city intersection and jumping onto the hood of a car, waving what appeared to be a long-bladed knife.
Watch: How Sydney attacker was restrained by locals with milk crates and chairs