**UPDATE** More explosive devices found in home of teen who set off homemade bomb in Michigan classroom. GET THE LATEST HERE.
(WWJ) A high school in western Michigan has reopened, a day after a student accidentally detonated a homemade explosive in a classroom.
Police said a 16-year-old boy brought the improvised firework-like device to Newaygo High School, north of Grand Rapids, Monday morning — causing an explosion that injured himself, four other students and a teacher.
The boy's injuries were described as "moderate to severe," according to police.
The high school was evacuated and K-8 schools in the Newaygo Public Schools district were placed on lockdown following the incident.
Police said the teen did not plan to detonate the device.
In a Facebook post, Superintendent Dr. Peg Mathis agreed, saying it was believed that the student didn't mean to hurt anyone.
"It has been reported that this was not an attack or designed to be something malicious, but a serious lack of judgment," Mathis wrote. "Due to the smell and smoke in the high school, we are sending high school students home for the day."
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In a community alert, law enforcement said involved officials "understand the anxiety and anxiousness" regarding the situation, but added that there was no immediate danger to the school or the public.
Schools officials later said the incident had been "stabilized," adding: "This is an ongoing emergency incident, local officials have procedures in place and have trained to respond as effectively as possible."
In an update Tuesday, the district said the high school was found to be safe after vents and the heating and cooling system were checked.
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