Tourists have been seen posing for photographs at the scene where a car fatally ploughed into pedestrians in Melbourne's city centre.

Images show two women striking a pose in between police cars as stunned passer-by watch on, metres away from where the horrific rampage killed four at about 1.30pm in Bourke St.

A small child is among four people who were killed in the carnage, after a maroon vehicle seen doing burnouts "deliberately" hurtled into crowds of shoppers, the Daily Mail reported.

As the event unfolded, pictures gradually emerged revealing the true horror of the incident

Police shot the driver before dragging him out of a car and arresting him. He was wearing nothing but red underwear when he was detained at the Elizabeth Street end of the mall.

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The mangled wreckage of half a pram remains stuck on the bonnet of the car, while what appears to be the other half is further up the mall at a pedestrian crossing on William Street.

The baby who was inside it is believed to have died at the scene.

"A male deliberately drove into pedestrians in the Bourke St mall," police said.

Source: TODAY

Officers said the incident is believed to be linked to a stabbing of a man in Windsor, in Melbourne's south east at 2am on Friday.

The 26-year-old man responsible for the rampage in Melbourne's city centre on Friday has been identified as Dimitrious Gargasoulas.

The Melbourne resident has a history of mental health and drug-related issues and was charged with family violence offences last weekend.