Around 220 traffic infringement notices, and 12 arrests after a night of illegal street racing across Waikato

Police Inspector Will Loughrin says more than 1,000 people blocked roads and exhibited unsafe driving behaviours overnight.

Police found a baby in one of the vehicles, calling the behaviour alarming and unsafe.

A number of cars and people blocked intersections, and two people allegedly involved were stabbed on State Highway 27 in Matamata, after midnight.