Sauk Rapids Police Chief Perry Beise says the boy randomly cut three children at Pleasantview Elementary School on Monday morning, then went into the office and set the knife down.
The incident took place before school started. Current and former students joined together on April 15 at Morgan's Wonderland in San Antonio to recognize the school's eight years of specialized service to children with autism. They were treated and released at a hospital, the Star-Tribune reports.
The boy cut three children with the knife in less than a minute. The incident resulted in three students being injured and the aggressor was contained in the office.
The injured students suffered superficial wounds that required stitches, according to KARE in Minnesota.
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The threats have been taken seriously by police and the man is expected to appear in court on Tuesday with a view to being remanded in custody over the offence, West Copenhagen Police have confirmed.
According to WCCO, children under the age of 10 can not be criminally charged. The case will be forwarded to prosecutors, KARE said.
Close to 100 parents and students who have walked the halls of The Foundation School for Autism gathered for the school's first ever homecoming celebration. Without any warning, the Minnesota elementary school student began slashing his classmates.
School officials say mental health support will be available for students and staff who witnessed the attack. There are approximately 790 students enrolled at the elementary school.