One person has been killed on a central Melbourne street where a knife wielding man was left in a critical condition after being shot by police.
Police initially responded to reports of a auto on fire at the corner of Bourke and Swanston streets.
Footage taken by witnesses showed police shooting the man after he threatened them with an object that appeared to be a knife.
Superintendent Clayton said there is no known link to terrorism at this stage and they are not looking for anyone else in relation to the incident.
The man again attempted to stab and slash at the officers several times before one policeman unsuccessfully tried to taser him and his partner shot the assailant in the chest.
Earlier, Ambulance Victoria said they had assessed three people at the scene.
"One person has been taken to hospital with a neck injury". The condition of the surviving pair is unknown.
Two other victims have been taken to hospital with injuries.
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Police shoot a man lunging at them with a knife on Melbourne's Bourke Street.
The exact circumstances are yet to be determined at this stage.
About 4.31pm, police send out a media alert asking the public to avoid the Bourke Street area.
The street where the vehicle caught fire was the scene in January 2017 of a fatal but not terror-related incident in which a man drove his auto at pedestrians at high speed, killing six people and wounding about 30.
Dozens of police cars are on the scene with helicopters overhead.
Witness Fiona told 3AW her friends had seen someone with a knife in the area and she'd been told he'd stabbed a security guard.
SBS News has contacted Victoria Police for comment. "The area has been cordoned off and the public are urged to avoid the area".
A Melbourne-based reporter tweeted that nearby buildings were placed on lockdown by the police following the incident.
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