BOONE, Iowa—The Boone School District locked down school buildings Monday after the High School was evacuated during a fire alarm. The evacuation and resulting search of the High School by law enforcement was the result of an email that was received that warned of a potential threat. Boone School Superintendent Brad Manard was able to inform parents and guardians of additional details about the incident in a letter released late Monday afternoon. In the letter, Manard said that “In light of recent school violence, the district took precautionary measures to ensure student safety and initiated the lock down procedure at all school buildings”. As it turned out, there was not an immediate threat to students. Manard did say that an All School Alert was released shortly before 3:00 PM but didn’t necessarily reach all district patrons. Steps are being taken to correct that problem. Manard also said in the letter that Tuesday will be a regular day of school for students, with regular classes in session. Boone Police are investigating the incident. No reason was given for the cause of the fire alarm.