CHICAGO (CBS) —  Eleven students  have been transported to area hospitals after a pepper spray incident on a school bus Monday afternoon, according to the Cook County Sheriff’s Office.

A student was testing pepper spray on the bus “not knowing the impact the spray would have in an enclosed spaced,” a spokeswoman for the sheriff’s office said.

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“We started coughing and, like, our eyes hurting,” said student Daniela Herrera.

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The bus was near West Church Street and Capitol Drive near Park Ridge  when the incident happened around 3:20 p.m.

The students were taken to hospitals for decontamination, but no serious injuries were reported.

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There were 55 elementary students on the bus.