The injury count could continue to climb after an illegal street racing meet up involving more than 1,000 people near Hamilton over the weekend.
Two people suffered serious stab wounds, and a baby was found in the back of a car being driven by someone who didn't have license at the event on State Highway 27 near Matamata.
Now police are investigating whether a bystander was sideswiped by a car drifting at high speed.
12 people have arrested and more than 200 tickets given out for various driving and alcohol offences at the event that was promoted via social media.
Investigators are now searching CCTV footage to identify more people who were there.
Inspector Will Loughrin says the community's had enough of the high risk, high speed antics.