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A school bus taking children on a field trip to a New Jersey historic site collided with a dump truck today, ripping the bus apart and killing a teacher and student. The crash left the bus lying on its side on the guardrail of Interstate 80 in Mount Olive, its undercarriage and front end sheared off and its steering wheel exposed. Some of the victims crawled out of the emergency exit in the back of the bus and an escape hatch on the roof. More than 40 people were taken to area hospitals.