An elementary school in Michigan was evacuated Wednesday after dozens of students were hospitalized, MyFoxDetroit.com reported. Rescue crews are trying to determine what sickened the students.

At least 27 students from Beck Centennial Elementary School in Macomb Township, a suburb of Detroit, had non-life threatening injuries and most showed signs of upper respiratory irritation, MedStar ambulance director of operations Scott Hicks told MyFoxDetroit.com.

According to Hicks, a fog machine being used for an upcoming school function is what caused students to become ill. He added that possibly more students will be hospitalized due to health complications.

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