Meridian school officials confirmed that three schools, Centennial High School, Lowell Scott Middle School and Joplin Elementary School, were all on lockdown this morning.
The lockdowns occurred after a security officer at Centennial High School approached a young man who was not authorized to be in the school's gymnasium, but the student fled from the building, leading to the alert.
Because of the close proximity of Joplin and Lowell Scott to Centennial High, all three were placed in "shelter in place" mode for over an hour.
The lockdown ended before the noon hour.
UPDATE 11:30 a.m.
Officials at Centennial High School confirmed that they ended a lockdown at its campus following an incident earlier this morning.
Law enforcement aren't giving many details yet other than saying a person, when confronted by security, left the building, prompting the lockdown at approximately 9:50 a.m.
ORIGINAL POST 11 a.m.
Officials put Centennial High School on lockdown, effective 9:50 this morning.
Ada County Sheriff's Office officials say a person, when confronted by police, left the building but the lockdown went into effect as a precaution.
School officials had already decided to cancel assemblies at Centennial and Mountain View high schools on Friday, Dec. 21, and ramped up security in the wake of a handful of threat-related text messages being passed through students' social networks. The threats referred to "something bad" happening at a Meridian high school on Friday, Dec. 21.
Officials said they had been actively working with law enforcement to trace the source of the messages.