Chicago (CBS) — A 14-year-old girl brought a water bottle filled with bleach to South Elgin High School Wednesday and threw it at a fellow student, police said.

The girl wasn’t hurt, but three staff members suffered minor injuries. Two staff members got bleach near their faces and one received an upper body injury.

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The 15-year-old victim of the attack had no reported injuries.

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Police say the fight started over a social media post.

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The suspect has been charged with two counts of battery.