The school bus was in the process of picking up students when an Academy commuter bus hit it from behind, The (Newark, N.J.) Star-Ledger reported.
The Academy bus crashed head-first into a tree, while the school bus, which had just a driver and an aide on board, rolled over and hit a generator and pumping station, police said.
Old Bridge Police Captain Arthur Carullo said the Academy bus driver, identified as Daniel Jean-Pierre, 42, suffered serious injuries. He was air-lifted to a Robert Wood Johnson University Hospital where he was listed in critical condition, said hospital spokesman Peter Haigney.
Another passenger, a 31-year-old woman, is also critical at Robert Wood Johnson, the spokesman said.
Others who were injured, including the school bus aide, were treated at the scene.