Thomas Edison High School in Minneapolis went into lockdown earlier Monday after two adults caused a disturbance inside the school.
Dirk Tedmon, Minneapolis Public Schools' officer of communications, released the following statement to Edison school families.
"When two parents caused a disturbance in our school, outside law enforcement joined staff and our School Resource Officer in resolving the situation. In order to ensure student safety during this time, we called a code yellow and kept all students in their classrooms.
While this was an unfortunate incident, it was isolated and resulted from the poor choices of a few individuals. At the same time, it comes on the heels of similar incidents last week, which gives us pause. We must keep working together to keep our school community safe for all."
It's unclear what the parents were doing to cause the lockdown, but a code yellow means there "is a potential outside or limited threat to the school," Tedmon wrote in an email to BMTN.
School and work continued during the lockdown inside the building and all outside visitors were not allowed inside.
Monday's incident happened less than a week after two highly publicized assaults at the school.
Last Monday, parents of a 15-year-old girl told KSTP that their daughter suffered a concussion when assaulted by three students in the cafeteria.
Then on Thursday, a 14-year-old student was knocked unconscious by another student and was transported to the hospital by ambulance. KSTP was informed by the student's parents that she suffered concussion and will have her brain scanned this week.
"We are troubled that these incidents happened on our campus and within our student body. This kind of behavior must stop," Principal Eryn Warne wrote a letter on Friday. "We will continue to work with our school and district teams to restore Edison to a place of peace and learning."