This could be terrorism:
https://www.theage.com.au/national/victoria/two-people-stabbed-man-shot-after-ca...One dead, two stabbed, man shot after car set alight on Bourke Street.
One person is dead and two others injured after a man, who set his car alight, attacked people on Bourke Street in Melbourne's CBD.
The suspect was shot by police and has been taken to hospital in a critical condition.
Two victims are also in hospital, including one with a head injury.
The centre of Melbourne's CBD is in lockdown. The Bourke Street Mall, including Myer and David Jones stores, have been evacuated.
Police said the man stopped his car on Bourke Street, not far from the Target store near the intersection of Swanston Street, and set it alight.
He then started attacking people with a knife, stabbing at least two people, before he was shot by police.
"Police are not looking for anyone further at this early stage," police said in a statement.
"A small number of people are being treated for stab wounds. The exact circumstances are yet to be determined at this stage."
Just after 5.20pm, a body was seen lying under a white sheet on Bourke Street, near the entrance to Russell Place.
There were large spots of what appears to be blood near the figure, as were a pair of men's black lace-up shoes. Only the soles of the person's feet were visible.
About 6pm, police confirmed a victim had died.
Police are telling all members of the public to avoid the CBD, although dozens of witnesses are being interviewed by officers at the scene. Trams along Swanston, Bourke and Elizabeth streets have been stopped.
Melbourne's anti-terror sirens and loudspeakers are being used for the first time, sounding out across Bourke Street.
The message over the loudspeakers says: "This is Victoria Police, please evacuate the area. This is Victoria Police, please evacuate the area."
Ambulance Victoria said three people were injured at the scene, including one person who suffered a neck injury.
A second person suffered a head injury and has been taken to hospital. Their condition is not yet known.
The fire on Bourke Street.