No one else was seriously injured.
Beise told The Associated Press he didn't know why the boy did it. "I have no problems with the school", said parent Treista Merdan.
School Superintendent Bruce Watkins says the boy lashed out at the other students until an adult intervened.
A traditional after school game played by California high school students is getting renamed after some said it was offensive.
This morning we had an unfortunate and scary incident that happened before school started.
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The incident took place in the hallway as students were heading to class. The parents of the three injured students chose to transport their children either home or to receive further medical attention. The incident resulted in three students being injured and the aggressor was contained in the office. He said the boy was co-operative with investigators. Mental health professionals are available on site at Pleasantview Elementary. He was interviewed and released to his parents. The case will be forwarded to the county prosecutor's office.
Children under the age of 10 can not be criminally charged in Minnesota. Watkins says he believes the injuries aren't life-threatening, and the students were taken to the hospital by their parents. Two of the students were cut in the back of the head and required stitches.
Staff and students at the school will be able to speak with mental health counselors if needed, according to KARE.
Robyn McDougle, the interim director of the Center for Public Policy at Virginia Commonwealth University's L. Douglas Wilder School of Government and Public Affairs, said school safety is an important and timely topic. Sauk Rapids is about an hour outside Minneapolis. It's similar to a game of tag, but this game includes seniors playing ICE agents and other students play undocumented immigrants.
Weapons in schools and school security have been ongoing issues in the U.S. The 8-year-old Minnesota elementary school student, who was not named, was talking to three of his classmate, ages 13,9, and 8 when he became verbally aggressive. There are approximately 790 students enrolled at the elementary school.