Jack says Waukesha officers and sheriff's deputies soon arrived to de-escalate the situation but the suspect "continued to ignore officers' commands".
Eventually, police say the officer was forced to fire at the student when he would not remove his hands from his pocket.
"The suspect is a 17-year-old male, he was transported to the hospital and was in stable condition", Waukesha Police Chief Russell Jack told reporters outside the school on Monday. Life-saving efforts were immediately put into action, and the remaining students were evacuated from the school. The officer, who was not named, is an 11-year veteran of the police department.
Terry Schuster, the public relations director for the Waukesha School District, said she understood it was the school resource officer who shot the student. The Freeman reports that a young man was loaded into an ambulance on a stretcher outside of the school.
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Waukesha police responded to South High School around 11 a.m. Monday.
Police said it was an isolated incident and that they are not seeking any other suspects.
Waukesha is a city of about 70,000 residents 20 miles west of Milwaukee.
Officers located the student in a Waukesha home and made an arrest.