It was an exceptionally risky high for Nosbisch, who knew that when he returned home, he would be facing his father—an agent for the Bureau of Alcohol, Tobacco, Firearms and Explosives.

The 17-year-old shooter, who was also a student at Antioch High School, later shot and killed himself with a handgun, Metro Nashville Police spokesperson Don Aaron said during a news conference.

By Steve Neavling FBI Director Kash Patel, who is also serving as acting director of the Bureau of Alcohol, Tobacco, Firearms and Explosives, is moving forward with a plan to reassign as many as 1,000 ...