The incident unfolded at The Covenant School on Burton Hills Boulevard in Nashville where officers "engaged" the attacker, who was described by police as a 28-year-old woman.

The shooter was killed on the school's second floor, a spokesperson said. She had two "assault-type riles and a handgun," according to the official.

Police said they first got calls about the shooter at 10:13 a.m. CT and Nashville firefighters first reported their personnel were responding to an “active aggressor” at 10:39 a.m. CT.

"The police department response was swift," police spokesperson Don Aaron told reporters.

"They heard shots coming from the second level. They immediately went to the gunfire. When the officers got to the second level, they saw a shooter, a female, who was firing. The officers engaged her. She was fatally shot by responding police officers."

Five police officers came upon the shooter and two opened fire on her, Aaron said. The shooter had entered the school through a "side entrance" on the first floor, he added.

"By 10:27 the shooter was deceased," Aaron said.

One officer was hurt by shattered glass, officials said.