7:30 PM - Calhoun Schools will resume as normal Tuesday.
5:40 PM - Police indicated they have the subject detained, reportedly the student's father had returned him to school. No other details available.
5:30 PM - Several Calhoun law enforcement officers were responding to Calhoun Middle-High School for an "active shooter alert," first reports indicated a 15-year-old could "on his way to the school" apparently with a weapon.
The alert was being considered as an active shooter threat.
It was unclear when officials first learned about the threat, likely by the School Resource Officer, Deputy Sheriff Wiley Tyler Raines.
Police were setting up road checks on all traffic and the school was on lockdown.
Superintendent Kelli Whytsell said after-school students had already been dismissed.
Whytsell said, "The situation was handled well by authorities, with no immediate danger." She will be releasing a statement about the incident.
More to follow ...