TROY — Triad High School was locked down for three hours Monday morning after a faculty member found a live round of ammunition on a stairwell, according to the Madison County Sheriff's Department.

Capt. Mike Dixon said the school resource officer notified the sheriff's department, and a dozen officers responded to the school.

Dixon said deputies secured the school building to "make sure there was no actual threat to the students."

Triad Community School Unit District 2 Superintendent Leigh Lewis said the school was on "code red lockdown" from 9 to 10:40 a.m. Monday and students were kept in their classroom.

"Student safety was our primary concern that's why we went into a code red lockdown in order to do a thorough search," Lewis said. "Certainly when we are faced with finding a bullet, you have to be very thorough and think about the student safety."

Officers from the sheriff's department and Troy Police Department conducted a search of the school including all buildings, lockers, students' backpack and students' pockets, Lewis said.

Dixon said an additional bullet was found by an officer at a different location in the building. He refused to disclose the exact type of ammunition.

"We didn't find any other items of concern that would jeopardize student safety," Lewis said.

The lockdown was lifted at 10:40 a.m. Monday. Lewis said students were permitted to go to their last class prior to going home at 11 a.m.; the school had a scheduled early release for a School Improvement Day.

Lewis said a notification about the lockdown was sent to parents of high school students.

Contact reporter Jamie Forsythe at 239-2562 or jforsythe1@bnd.com.