A female shooter opened fire at a private Christian grade school in Nashville on Monday, killing three children and three adults, officials said. The suspected shooter was fatally shot by police, authorities said.

Authorities have not released the names or ages of the victims, but all three adults who were fatally shot worked at the school. Police have identified the shooter as a 28-year-old woman from Nashville, and officials said that she was armed with "at least" two assault rifles and a handgun.

Officials responded to the shooting at Covenant School in Nashville's Green Hills neighborhood on Monday morning.

Officers entered the first story of the school building and began to clear it when they heard gunfire on the second level, said Don Aaron, a spokesperson for Metropolitan Nashville Police Department. The officers moved upstairs and saw the shooter firing, and at that point they "engaged" her. She was fatally shot by two of the five responding police officers at the scene, who opened fire, he said.

The shooter entered Covenant School through a side door and traversed the building, moving from the first floor to the second floor and "firing multiple shots," Aaron said.