A gunman enters a school and begins shooting. He kills six students before turning the gun on himself.
A gunman enters a college, kills 32 and wounds 17 before killing himself. There were no weapons permitted on campus.
A gunman enters a school campus and kills three before being subdued by armed students.
A man enters a shopping mall, which does not allow weapons on property, and kills 6 people during a 3 hour standoff.
A man enters a shopping mall, which does not allow weapons on property, and kills 9 people before turning the gun on himself.
A man enters a church containing 7,000 worshipers. He has 2 pistols, a rifle and over 1,000 rounds of ammunition. He shoots 3 people in the parking lot before he is confronted by a woman with a concealed weapons permit. She shoots him, and he then takes his own life.
Note that when armed defenders are present, the criminal is stopped after only a few shots. When the policies of the facility ensure a safe environment for the criminal to carry out his crime, the death toll is higher.
Just as I have said all along, defenseless victim zones do not work. Armed resistance does.