loudspeakers-- Speakers all over campus not used after 1st shooting

This article at Alex Jones points out that there were loudspeakers all over campus. [+].

"Cho was certainly no slouch, in the two hour gap between the first reported shootings and the wider rampage that would occur later in the morning, during which time the University completely failed to warn the students despite having loudspeakers stationed throughout the campus, Cho had time..."