Local 10 News said that the Knoxville police officer who was wounded in the shooting was expected to survive.
Tennessee Bureau of Investigation Director David B. Rausch said at a news conference Monday that police found the student in a bathroom at Austin-East Magnet High School in Knoxville, a city about 180 miles (290 kilometers) east of Nashville. The officer was hit at least once and was taken to the University of Tennessee Medical Center with injuries that were not life-threatening.
A source, who was not authorized to talk about the incident at Austin-East Magnet High School, told Knox News that the situation was not "active" anymore.
The school is a Title 1 school, which is a federal program that provides financial assistance "schools with high numbers or high percentages of children from low-income families", according to the United States education department. Police reported that an armed gunman entered the school and fired as he was approached by police.
Law enforcement officers respond to a shooting at Austin-East Magnet High School.
Tennessee Governor Bill Lee said he wanted to "acknowledge a very hard and tragic situation we have happening across at Knoxville Austin-East Magnet High School".
The police department had earlier said "multiple gunshot victims" were reported. "Please avoid the area", the agency said in a tweet.
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Authorities remained at the complex after dark on Saturday, with yellow police tape stretched in front of the building. Who is Nikki Reardon? It was the children's grandmother who discovered them, police said according to CBS LA .
KPD said preliminary investigations found it was a man that was armed at the school.
The school was the subject of media reports in February after three students were shot to death over a three-week span.
One male died at the scene and another was detained by officers.
Knox County Schools Superintendent Bob Thomas said in a tweet the school has been "secured" and that the students "who were not involved in the incident have been released to their families". "It's a place where people are learning".
It said the Tennessee Bureau of Investigation, a state-level department, would lead the probe into what happened.
"I just wanted to make reference to that and ask, for those who are watching, online or otherwise, to pray for that situation and for the families and the victims that might be affected by that in our state", he said.