One person was confirmed dead after multiple stabbing incident during rush hour in the Australian city of Melbourne, police said on Friday, as the city was placed on lockdown.
One person was believed to be in a critical condition in hospital suffering a neck injury, a statement from Ambulance Victoria said.
Officers were initially called to reports of a auto fire near Bourke Street, a busy thoroughfare, at about 16:20 local time (05:20 GMT).
The vehicle later burst into flames "exploding" and several people were stabbed by the unidentified male, who also tried to stab police officers, who later shot him dead.
Police shot a man who threatened officers with a knife and he is in a critical condition in hospital, Victoria Police Superintendent David Clayton said.
Police warned people to avoid the area, but said they "are not looking for anyone further at this early stage".
They said the suspect, who was hospitalised in a critical condition, had no known links to terrorism.
He said: "Three people have been stabbed, unfortunately one of them is deceased at the scene".
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Police are telling all members of the public to avoid the CBD, although dozens of witnesses are being interviewed by officers at the scene. A Reuters witness said that the city centre was closed off by police and that dozens of officers were patrolling.
'Police response was swift and overwhelming.
"Passers-by were calling out that members of the public had been stabbed", Supt Clayton said.
A man has been arrested and is under police guard in hospital. We'll keep an open mind as to whether there's any link.
Two other victims have been taken to hospital with injuries. "Police are now at an incident on Bourke St in the CBD".
Friday's attack is a double blow for the city as it coincides with an ongoing the murder trial of 28-year-old James Gargasoulas, who ploughed his vehicle into crowds in the same area in 2017, killing six people.
"I didn't know what was happening there was just so much chaos and screaming".
Another witness on a passing tram told ABC Radio it seemed police had been trying to subdue a man who was waving something.