During the Jokela High School shooting in Tuusula, Finland, head teacher Helena Kalmi immediately ordered all students and teachers via the PA system to barricade themselves inside their classrooms after she was alerted to the shooting by the deputy head teacher at 11:47am.
The Jokela school shooting occurred on 7 November 2007, at Jokela High School in the town of Jokela, Tuusula, Finland. At 11:47, head teacher Helena Kalmi was alerted to the shooting by the deputy head teacher. She immediately ordered all students and teachers via PA system to barricade themselves inside their classrooms. 
