The device detonated inside a classroom, injuring the 16-year-old and four classmates sitting nearby. School administrators dialed 911, the school was immediately evacuated and students were transferred to the bus garage as emergency services arrived on scene, police said.
All Newaygo County schools went into lockdown in compliance with the county’s emergency operations plan until authorities determined there were no further threats to students.
Based on the initial investigation, it appears the student had no ill intent and did not intend to detonate the device, Newaygo Police spokesperson Michelle Robinson told CNN.
The 16-year-old was taken to the hospital for moderate to severe injuries, while the four other students were taken to the hospital by their parents for minor injuries. The classroom teacher also went to the hospital, as the explosion involved smoke and there was concern about the chemicals potentially used in the device, Robinson said.
“The investigation continues into what kind of material was involved in the explosion and the circumstances contributing,” the state police said, adding that the FBI and Bureau of Alcohol, Tobacco, Firearms and Explosives were on scene to help identify the explosive materials involved.
CNN has attempted to reach Newaygo Public Schools for comment.