An 11th grade student at Antioch High School was arrested a day after a chemical reaction explosion in a boy's restroom.
The 17-year-old is being charged in juvenile court with possession of a prohibited weapon.
During an interview, he confessed to putting reactive chemicals into a plastic water bottle and placing it in the restroom. The bottle exploded at 9 a.m. Monday, forcing the school to be placed on lockdown while the matter was investigated.
Officials believe the device was detonated as part of a student prank. No one was injured and there was little damage to the bathroom.
While some parents arrived and tried to sign their children out of school, they were not allowed to do so during the lockdown.
"The parents have to know what's going on with their kids. This is ridiculous. It's the last straw. I can't handle it any more," said parent Lilea Aparicio. "Somebody is going to get killed inside a school. That's what my biggest fear is."
District officials said the policy is in place for the safety of the students.
"There are no students showing any ill effects, so it's not the type of an explosion to cause any large disruption," said MNPS Assistant Superintendent Tony Majors.
Police brought bomb-sniffing dogs to inspect the school, and no other devices were found. Investigators are now checking the school's hallway surveillance footage to see if they can identify the person responsible.
The school has a zero-tolerance policy that means any students involved could face expulsion in addition to criminal charges.
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