Potential Active Shooter Incident at Osan AB Published Nov. 30, 2014 By 011114 OSAN AB, REPUBLIC OF KOREA -- Osan American High School, Middle School and Elementary School are on lockdown here, along with the entire installation following reports of an active shooter in the location of the school. Security forces have arrived on scene and are completing sweeps. Sweeps are 50% complete. No unusual activity has been reported at this time. Personnel are advised to avoid the area and remain under cover until further notice. Additional details will be provided as soon as they become available. For more information, please contact the 51st Fighter Wing Public Affairs office at 784-4044 or 031-661-4044.