We have published some pictures of the incident today. He shows the car on fire, the man who is fighting with the police and the suspect being arrested.
Warning: Some viewers may find the footage painful.
A deadly blow and two bystanders wounded at the Melbourne CBD – video
The Victorian opposition leader, Matthew Guy, thanked the police.
Matthew Guy MP (@ MatthewGuyMP)
Stay away from the CBD until the authorities complete their investigations. Today, more than ever, we thank police and first responders for the incredible work they do for us all.
Will Mitchell said that he was having a haircut at the Target Mall when people started running screaming.
"The hairdresser runs, runs, runs, runs and runs running and closes the shop," he said. "I went out to see what happened and there was a car on fire.
Traffic signs are visible during an incident on Bourke Street in Melbourne. Photography: James Ross / AAP
"I was on the other side of the road and the car was on the other side of the road, next to Target. I was just across the street, where the Starbucks coffee was, and I felt the warmth of the car. All I have seen is the bustle and people running everywhere. Then I stayed and the police cordoned off the area. "
Members of the public are welcome to download any video of the attack to the Victoria Police.
Victoria Police (@VictoriaPolice)
If members of the public have images or video footage that can assist the police in his investigation of the Bourke Street incident that occurred shortly after 4 pm today, they are encouraged to download them here https: / /t.co/swUcgLVz23 pic.twitter.com/XD2ST6y6aT
Bourke Street was closed by Vic Roads for an indefinite period.
There is no access to Bourke Street from Swanston Street, otherwise Exhibition St. Russell Street remains open to traffic. Bourke Street will be reopened when police investigations are completed.
People were told to avoid the CBD tonight if they could.
Clayton also shared more details on how the attack was mastered.
"The nearby police quickly responded to the incident [of a car on fire in Bourke Street]," he said.
Burnt vehicle seen on Bourke Street Photo: Robert Cianflone / Getty Images
"When they got out of the car, they were confronted with a man waving a knife and threatening them. At the same time, passers-by were shouting that members of the public had been stabbed.
"The police shot the man in the chest and he is now in critical condition under surveillance at the hospital."
You can watch the full press conference below.
Victoria Police (@VictoriaPolice)
We live with Superintendent David Clayton following an incident at Bourke St in the CBD this afternoon. https://t.co/OkzIPBVb3m
It's so strange. Spectators were evacuated and only the media and the police were allowed to stay.
Bourke Street after it's closed. Photo: Melissa Davey for the Guardian
City loudspeakers for mass incidents are used and a warning message to avoid the area sounds on the empty streets except for emergency cars, police and a scrum of press.
We are waiting for a press conference to start. It starts raining.
"Some people in the streetcars said that someone had a knife and when I got up and looked out the back window, I could see a big flaming torch crossing the road. She said.
The car on fire in the background. Photography: @_sarah_sarah
Emergency work is being done on Swanston Street in Melbourne CBD. Photography: James Ross / AAP
"It sort of stopped on the other side, then I saw a man and two policemen somehow trying to calm him down. He waved his arms, someone said he had a knife – I could not tell where I was from.
"And shortly thereafter, I heard a loud bang that sounded a bit like a shot, nothing like an explosion, and then a person near me said that she could see something." One with chest compressions, one ambulance and 50 police cars. came out of nowhere soon after. "
I just spoke to Neil McKellar, who works in the Hylands Bookstore on Bourke Street, right next to the stage.
Emergency work is visible on Bourke Street in Melbourne CBD. Photography: James Ross / AAP
McKellar spoke of hearing a loud explosion and then shots. He has just left his building and walked down Little Bourke Street, not far away. He added that the scene was restricted and that police and emergency services were present.
The scene seemed to be under control.
"We heard the explosion and shots later," said McKellar. "We are in a former Bourke Street cinema. We heard it but we did not know what it was. "
The man, whose identity is unclear, is nicknamed by some "Trolley Man".
Another sequence, extracted from the social media application in Chinese language WeChat, shows the alleged attacker lying on the ground, handcuffed by the police.
Meanwhile, the police are expanding their lines.
Melissa Davey (@ MelissaLDavey)
Police swiftly remove people from Swanston Street Extending police lines #BourkeSt
Alert system in effect although someone can meet me at the corner of Bourke and Swanston with a portable charger, I will cry for joy @naamanzhoupic.twitter.com/ewr72IndzP