A boy is in custody after entering Andover High School after hours Monday and assaulting a female student, then assaulting a teacher and threatening to kill others, according to the Anoka County Sheriff's Office.
The sheriff's office says deputies were dispatched to the north metro school at 4:33 p.m. on a report of an assault in progress. Investigators learned that a juvenile male, who is not a student at Andover High School, entered the school and assaulted a girl in the library.
The girl was punched in the head and kicked several times before a teacher pulled the attacker away. The juvenile suspect, whose age has not been released, is then accused of head-butting and kicking the teacher who intervened.
The girl was treated at the scene by paramedics and released to a parent while the teacher who was assaulted reported no injuries.
Deputies arrived at the school and took the boy into custody, booking him into the Lino Lakes Juvenile Detention Center where he is facing charges of fifth-degree assault and disorderly conduct, in addition to trespassing.
Authorities say the boy also made mention of a knife and threatened to kill other teachers, the sheriff's release says, noting that a knife was not found nor used during the incident.
It's unclear what provoked the attack, but the release says the boy gained access through a secure entrance when another student left the school. He is believed to have had a confrontation with another person outside the school before getting inside.
Andover High School security and staff have been credited with following proper protocol to stop the assault and ensure safety to others in the school.
The incident remains under investigation.