"April 16 , 2007 : Seung-Hui Cho , 23 , fatally shot 32 people"
"Does n't count . Took place in a `` gun free zone `` . By law no guns are allowed there , so by law this incident could n't take place ."
"Seung-Hui Cho , 23 , fatally shot 32 people"
"By law no guns are allowed there , so by law this incident could n't take place ."