Between 40 to 60 students and others were taken to Good Samaritan Medical Center in Suffern and Nyack Hospital, New York State Police said.
One of the buses rear-ended the other on the Exit 11 ramp around 2:30 p.m., they said.
The students were returning from a sophomore class day trip to Woodmont Day Camp in New City in Clarkstown.
An investigation of the crash is ongoing, state police said.
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