The accident happened on Route 18 South at Eggers Road just after 9 a.m.
There were approximately 14 students on board at the time, and East Brunswick police said they belonged to Yeshivat Netivot Montessori, a Jewish school in East Brunswick.
Here is video from NewsCopter 7 showing the scene of the crash:
Mini-school bus, bus accident in New Jersey
Three victims were rushed to Robert Wood Johnson University Hospital in New Brunswick, while the rest were brought to the hospital in a mobile ambulance bus. The most serious injury appears to be a 4-year-old boy who suffered a broken leg, who was admitted. The other 13 were evaluated and released.
Nobody on the other bus, operated by Academy, was injured.