A 6-year-old student got at least 10 packs of heroin into a classroom on Tuesday at Commodore John Barry Elementary School in Philadelphia.

A first-grade teacher saw one of her students playing with the packets — two had been opened and one had been chewed open, authorities told CBS Philly.

“We do have one student saying that the young lady who did bring the substance to school did have that packet in her mouth,” Police Lieutenant John Walker told reporters.

Since heroin can be deadly, even if absorbed in small amounts, all 20 first-graders were rushed to the Children’s Hospital of Philadelphia in a yellow school bus.

No illness was reported. The students were examined and released, news reports said.

“I was afraid,” Danitra Salley, a parent of one of the children in the class, told CBS Philly. “My son is just 7 years old. He shouldn’t be exposed to something like that. It just doesn’t make sense to me. It should never have been in the home.”

The mother of the drug-toting 6-year-old declined comment as she left the school to be interviewed by investigators, CBS Philly reported. Though police said a school-wide search found no other narcotics, police told “Eyewitness News” they searched the child’s home and expect to file charges against the child’s mother and her boyfriend.