Five people were arrested at Brainerd High School on Wednesday morning in what was described as a "family dispute."
Officials said several members of a family were allowed into the school by saying they were going to check a student out.
They, along with a student, then got into an altercation inside the school.
Two adults and two juveniles were arrested.
School official Tim Hensley said, "They used it as a ruse to get inside."
One of the adult family members was taken from the school by ambulance.
Officials said the family members came after being called by a student.