Thursday morning Central High School administration received a call that there was a disturbance on one of its incoming buses.
Officials said, "Administrative staff met the bus and retrieved the students involved. Because someone thought a gun may have been present, law enforcement was quickly engaged and the school was placed on lockdown.
"A thorough search and investigation was conducted. No gun was found, an all clear was given, and the lockdown was lifted.
"School activities have resumed on a regular schedule.
"The students involved in the altercation on the bus were disciplined per HCS policies and procedures.
"Safety is our highest priority and we appreciate the quick response by faculty, staff, students and law enforcement."
Hamilton County Sheriff’s Office officials said, "Personnel responded to reports of an altercation and a student in possession of a firearm on a bus going to Central High School.
"Multiple units from the HCSO and Chattanooga Police Department responded to the scene and were able to identify and locate the students involved in the incident. Since the students had already entered the building, Central High School was placed on lockdown until a search was conducted of all the parties involved and no firearm was found.
"At this time three juveniles are being charged with disorderly conduct, and the HCSO School Resource Unit is still investigating the firearm threat."