At least five high school students and one teacher were injured in Michigan’s Newaygo when a 16-year-old detonated a homemade explosive device at school, local police said.

“On 3/08/2021 at 8:52 AM [13:52 GMT] Newaygo Police Department Officers were dispatched to the Newaygo High School for an explosion inside a classroom. Preliminary investigation has determined that a 16-year-old student accidentally detonated a homemade explosive device he brought to the school. The device detonated in the classroom, injuring the 16-year-old and four additional classmates,” police said in a statement.

The school was evacuated and all Newaygo County Schools went into lockdown until all threats were cleared.

“The 16-year-old was taken to the hospital for moderate-severe injuries while four others went to the hospital by their parents for minor injuries. The classroom teacher also sought treatment at the hospital,” police said.

The US Federal Bureau of Investigation (FBI) arrived on the scene. The exact circumstances of the incident are being investigated.

Source: Agencies