The school district says the student was involved in a violent altercation and taken to a hospital. The extent of the student's injuries were not immediately known.
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A folding knife was recovered from a backpack at the scene.
Wednesday's stabbing was the second dangerous incident for the district in the day.
Just before 3 p.m., a weapon was found in a dumpster on the Cedarbrook K-8 campus. Police are now trying to figure out who put the weapon there.
The Plainfield Public School District says it remains committed to maintaining the safety of its students.
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This story will be updated as more information becomes available.
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