Classes resumed Friday for a middle school in Lowell, Massachusetts, after students came down with a mysterious illness Thursday.
Students began coming down with symptoms throughout the morning. The sickness affected around 20 kids, all of whom are seventh graders.
Students kept going to the nurse with complaints of nausea and dizziness. It got to the point where Lowell General Hospital brought a physician on scene to start evaluating the kids.
The school was evacuated at 11:30 a.m. as a precaution.
Five our six students were transported to the hospital, but they were never admitted. Their parents later picked them up. Majority of the affected kids are back in school Oct. 30.
At first authorities believed carbon monoxide was to blame, but meters showed no readings. It's still unclear as to what caused the kids to get sick.
Officials say none of the illnesses are considered serious.
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School officials say all of the Lowell public schools were cleaned Thursday night.