Authorities say more than 30 people have been hurt in a Lincoln Tunnel crash after a commuter bus rear-ended a tour bus carrying students from Canada on a graduation trip.

A spokesman for the Port Authority of New York and New Jersey police says 35 to 40 people on a New Jersey Transit bus were hurt in Wednesday's crash. The four most seriously injured suffered neck and back injuries. The Fire Department of New York says none of the injuries are considered life-threatening.

A 32-year-old woman also went into labor while stuck in the tunnel. She was taken to a hospital.

New Jersey Transit says approximately 60 people were on its bus, which had left Cresskill for New York City.

Both lanes of the center tube reopened before noon, about two hours after the crash.