Officers from the Knoxville Police Department reportedly confronted the student in a bathroom after being warned he might be armed. An officer was also injured in the shootout.
Police faced gunfire as they responded to reports of a possible gunman at a Tennessee high school Monday, leaving one person dead and an officer wounded, authorities said. It wasn't yet clear why the student brought a gun to school or why he fired at officers.
One person was detained for further investigation, officials said.
"This wasn't a school shooting. So it's not a school shooting".
The school where the shooting happened provides academic and arts classes to more than 640 students in East Knoxville, according to information from the school's website.
The incident took place at Austin-East Magnet High School at around 3pm.
Police urged people to avoid the area, adding a reunification site had been set up on a baseball field behind the school for students to be reunited with family. "He said he'd rather be hurt than anybody else", Mayor Indya Kincannon told CBS News.
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There are 1,397 people in hospital, a jump of 236 from the day before, and 504 people in intensive care. The report says it's not expected Premier Doug Ford will order schools closed.
Monday's shooting was the latest in a spate of teen violence in Knoxville this year.
Multiple people, including a police officer, have been shot at a high school in Tennessee, USA.
"This is the fourth unnecessary shooting involving the Austin East community this year and we must make sure we take every step and make every effort to prevent these tragedies from continuing to occur", McKenzie aid. Police said they responded to the school around 3:15 p.m. and when they encountered a male with a gun, shots were fired.
Still, David Rausch, director of the Tennessee Bureau of Investigation, said it was important to note that the student had not done anything with the firearm until the officers engaged with him.
That includes a 15-year-old who was accidentally shot by another teenager in January and a 16-year-old who was fatally shot in February while driving home from school.
The shooting came just a few days after Lee signed legislation allowing most adults in the state to carry a handgun without a permit.
This latest incident follows recent mass shootings Colorado, Atlanta and SC that have led to a push by the Biden administration for gun control reforms.