The mother of the man accused of mowing down pedestrians on Bourke Street on Friday, killing five, says she's ashamed to be his mum.
The death toll from the car attack on pedestrians rose from four to five on Saturday night, after a three-month-old baby died in hospital.
A 10-year-old girl is also dead, while more than 25 people remain in hospital after being hit when a driver mounted the footpath and drove into crowds on Friday.
The driver, Dimitrious "Jimmy" Gargasoulas, remains under police guard after being arrested.
His mother, Emily Gargasoulas, told reporters on Saturday she felt sick it was allegedly her son.
"I'm ashamed, I'm ashamed to be his mum," Ms Gargasoulas said.
'I couldn't believe it darling, it make me feel sick."
She also apologised, saying she was "so so sorry".
Before the Bourke Street incident, Gargasoulas also allegedly stabbed his brother Angelo and injured his mother's partner, before evading police for hours.
His girlfriend, Akiir Muo said she was taken hostage by Gargasoulas and thought she was going to die when he started driving erratically.
"I was trying to get out of the car but I couldn't," Ms Muo told reporters.
"He had me in the car and he was driving way too fast."
She says he pushed her out of the car and fled from police before he travelled to the CBD.
AAP