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A senior prank that covered the floors of a suburban Chicago high school with baby oil and vegetable oil has left three students and a custodian injured.
Bartlett High School Principal Kevin Skinkis says six male seniors are accused of pouring the oil on stairs and hallways early Friday. He says the mixture caused an "oil slick" on campus.
The oil was tracked around the school, and all 2,700 students were held in class for more than two hours as the floors were cleaned.
The custodian was taken to an urgent care center with a wrenched back, and the students were treated for bruises. Skinkis says the injuries are minor.
The students allegedly involved could face suspension or loss of their graduation privileges. Police are also investigating.