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ASHLAND, Ohio (WJW) -- An undisclosed number of Mapleton Local School District students were sickened by an unknown substance on Friday, Aug. 29.

Some of them were transported to local hospitals, authorities told FOX 8 News.

Emergency vehicles were reportedly seen near a school district building early Friday afternoon. The Ashland County school district office is located along County Road 801.

Authorities did not say exactly how many students were affected or give an update on their conditions.

It's still unknown what caused the students to become sickened. The school building has since been cleared and declared safe.

A Columbia Gas spokesperson in a statement issued to FOX 8 News said the utility was called to the school a

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