A school bus full of students returning from a trip to an amusement park overturned on the New Jersey Turnpike.

According to New Jersey State Police, the crash happened Thursday around 4 p.m. in the northbound lanes near Interchange 13 and the Goethals Bridge.

Police say four fifth graders and an adult were taken to the hospital following the crash, but they say that their injuries did not appear to be serious. 

The bus was carrying students, mostly fifth graders, from the Mevaskshei Hashem yeshiva in Borough Park, Brooklyn.

The bus was apparently traveling as part of a convoy of six buses from the amusement park in South Jersey.

Students were forced to climb out of the emergency exists. Children on the bus tell News 12 they were helping each other out. Many were not wearing seat belts at the time, according to at least one student.

A portion of the Turnpike was closed for a few hours while crews cleared the crash, leading to heavy traffic around the evening rush hour.

The State police are investigating, but the school has said they believe there was a sudden mechanical issue on the bus.

The incident comes three weeks after another school bus overturned on Interstate 80 in Mount Olive when it was struck by a dump truck. Two people were killed and dozens were injured in that crash. The driver in that crash is now facing vehicular homicide charges.