By Bria Brown

NEWAYGO, Mich. (AP) — A 16-year-old student who lost both thumbs after his homemade explosive went off in a high school classroom in western Michigan has been charged.

A preliminary hearing for the teen was held Wednesday. He is charged with manufacture/possession of a Molotov cocktail or similar device and possession of a weapon in a weapon-free school zone, the Newaygo County prosecutor’s office said.

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A homemade explosive was taken March 8 to Newaygo High School and accidentally detonated, police said.

The teen, four other students and a teacher were hurt.

His father later was charged with contributing to the delinquency of a minor and manufacture or possession of a Molotov cocktail after police searched his home.

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A child welfare investigator, Jessica Held, has told a judge that police don’t believe the boy wanted to harm others.

He “brought it to school to show friends when it went off in his hands,” Held told a Newaygo County Probate Court judge last month.

The teen was suspended from school.

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