Binghamton, New York – 13 innocent people murdered. In a gun-free zone.
Quotes from an article by John R. Lott, Jr.:
every single multiple victim public shooting in the US involving more than three people killed took place in one of these gun-free zones.
when attacks occur, having civilians with permitted concealed handguns limits the damage. A major factor in determining how many people are harmed by these killers is the amount of time that elapses between when the attack starts and someone is able to arrive on the scene with a gun.
Note that these are not opinions – these are facts than can be demonstrated statistically.
ADDENDUM: Tamara, of View From The Porch says:
the only thing that stops a spree killer is a gun. The body count is determined by whether the gun is already on the scene or needs to be carried there in the holster of a cop.
Gun free zones are not safe places to be. Too bad most government entities think posting a sign will keep out evil people. Instead, those signs just strip you of your ability to save yourself and others.