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PHILADELPHIA — Twenty first graders were taken to a Philadelphia hospital Tuesday after a six-year-old student brought 11 packs of heroin to an elementary school, according to KYW-TV.

Police say they were called to the school after a teacher saw one of her students playing with the packets. Two of the packets had been opened and one had been chewed on.

Parents were shocked to learn their children may have been exposed to the drug, which has the potential to be deadly. All 20 students taken to the hospital were examined and released.

A female first grader was identified as the student who brought the drugs to the school.

Narcotics and endangerment charges have been filed against the girl’s mother, Marie Hunter, 32, and her mother’s boyfriend, Christopher White, 28, KYW-TV reports.

A search of the mother and boyfriend’s home led to the seizure of more drugs.