This is so sad to witness people lose their lives. There is no need to say how depressing, shocking and terrible it is to know they were some young students, attending their daily classes. This is so sad, so unacceptable.
Even in something like this some people show courage:
Liviu Librescu, 76, an engineering science and mathematics lecturer, tried to stop the gunman from entering his classroom by blocking the door before he was fatally shot, his son said Tuesday from Tel Aviv. [Yahoo! news]
I truly sympathize with families of the victims.