ORLANDO, Fla. Lake Highland Preparatory School welcomed students back for the first day of the fall semester Thursday and was temporarily placed on lockdown while authorities searched for a suspect near the campus, according to school staff. Orlando police responded to a potential threat at a nearby chiropractors office prompting the lockdown, according to the police department. The Lake Highland Preparatory School campus is secure. All Highlanders are safe, Lake Highland Prep President Alfred Harms Jr. said in a statement. While public school students in Orange County started school Monday virtually, they wont return for in-person learning until Aug. 21.