All schools in Ellicott District 22 were on lockout Monday as deputies investigated a possible school threat.
The threat was found to be not credible, but the investigation is still ongoing, according to Gazette news partner KKTV.
According to the district, a parent contacted the school Sunday regarding the potential threat. Rumors first began circulating Friday, but the district was not notified until the parent Sunday night.
The district says as soon as they were informed of the threat, it contacted the El Paso County Sheriff's Office and began an investigation.
Under a lockout, no one is allowed in the building without valid identification. Students who must leave the building between classes are escorted by teachers.
The lockout affected all schools because of their proximity to one another.