The youths, aged between 14 and 18 including one female, were arrested after a series of police raids this morning. The teenagers are expected to be charged with offences including armed robbery, attempted armed robbery, assault and property damage later today.
Police Superintendent Rick Nugent said the alleged offenders' ages were shocking as was the violence of their alleged crimes, according to local media reports.
"It's extremely concerning," he said, adding that "we saw from the vision of the taxis that it's a very violent crime that's been committed on these taxi drivers and it's very concerning that people of this age are involved in this kind of activity."
A taskforce was set up yesterday to probe the series of robberies. Most of the offenders are expected to face a children's court once charged.
Investigators from the taskforce raided four properties in the western suburbs after a briefing at Sunshine police station about 6.30am. Nugent said police did not expect to make any further arrests in relation to the robberies.
Five cabs were targeted in 90 minutes starting midnight on Sunday, police said, adding a group of seven males using stolen cars and wielding baseball bats were responsible for the attacks.
30-year-old Indian driver Harpreet Gill was driving his taxi through Sunshine suburb when his car was rammed from behind and a second car pulled up abruptly in front of him.
Gill said he handed over his mobile phone and some 150 Australian dollar in cash. He was then punched in the face which resulted in cuts to his nose and lips.