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NEWAYGO, Mich. – A teacher and five students were injured Monday after a student accidentally detonated a homemade explosive device in a Newaygo, Michigan, classroom.

The 16-year-old student, who has not been identified, was among those injured in the blast, and Michigan State Police discovered and detonated multiple explosive devices at the teenager’s home overnight, MLive.com reported.

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Newaygo police Chief Georgia Andres told The Detroit News that the student, who sustained “moderate to severe” injuries, showed a “severe lapse in judgment,” but he called the explosion “definitely not something (the student) intended.”

Classes resumed Tuesday after the ventilation system at Newaygo High School was deemed safe, the school district confirmed.

According to Michigan State Police, the four other injured students were taken to an area hospital with minor injuries, and the injured teacher also sought medical treatment, but the severity of those injuries was not disclosed, The Detroit News reported.

Investigators executed the search warrant at the student’s Newaygo home at around 5:30 p.m. Monday, and multiple nearby residents posted on social media that they felt their houses shake during the professionally-directed explosions. Meanwhile, residents in a particular three-block radius told MLive.com that police would not allow them in their homes during the controlled detonations.