CHICAGO - At least one student from a Chicago elementary school was hospitalized Wednesday morning after possibly overdosing on an unknown substance, officials said.

What we know:

The incident happened at Tanner Elementary School, located at 7350 S. Evans Avenue.

In a letter to families, Principal Jacqueline Dillard said staff was notified before the start of the school day that "some members of the school community consumed an unknown substance outside school grounds."

Parents of those involved and the Chicago Public Schools Office of Safety and Security were alerted, she said.

Officials have not released details about what was consumed or who was involved. Dillard stressed that no prohibited or unknown substances were brought into the building.

"Everyone is safe and our school da

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