WALLED LAKE, Mich. (AP) – The state police bomb squad had to be called to a high school after a chemistry student made suspected TNT as part of a class project.

The squad removed and detonated the material. The three beakers reportedly went off with a big bang Thursday. No one was injured.

“We still have to analyze the material to determine if it even was TNT,” Oakland County Undersheriff Michael McCabe told The Detroit News.

Sheriffs deputies and officials at Walled Lake Central High School said the 17-year-old junior made the material as part of his final experiment for the class.

He told the teacher he would make the TNT at school under close supervision, they said. He found a TNT recipe on the Internet and planned to make enough to blow up a watermelon, investigators said.

“The teacher, unfortunately, did not take the student’s comments about his intentions seriously,” Principal David Barry wrote in a letter to parents.

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