Police say a third-grader in Pennsylvania handed out more than 60 small bags of heroin to his classmates before his teacher discovered them.

Wilkinsburg police say the 8-year-old brought the bags to Turner Elementary School on Tuesday. At a news conference Wednesday, police said some of the bags were found empty in a trash can, but there was no evidence the kids had ingested the drugs.

Police say the bags were stamped with the words "trust me."

School officials sent a letter home to parents about the incident.

Police are investigating how the boy got the drugs.

Wilkinsburg is about five miles (eight kilometers) east of Pittsburgh.