At least 20 students were injured Wednesday morning in a stabbing incident at Franklin Regional Senior High School in the Pittsburgh area, said Dan Stevens, an emergency management agency spokesman. Four people were flown to hospitals by helicopter, he said. Dr. Chris Kaufmann at Forbes Regional Hospital in Monroeville, Pennsylvania, spoke to CNN on air. He said the facility is treating seven teens with stab wounds to their torso, abdomen, chest and back areas. He said that the injuries were "quite serious" and that "some are clearly life-threatening." An adult is also being treated there, he said.

What she said:

Gun nuts will argue that this proves the futility of banning guns. Ban guns—or make them harder to get, or institute "onerous" background checks, or require mandatory training for gun owners—and the bad guys will use something else. Knives! Minivans! Cinderblocks! But knives are less deadly than guns and a knife attack is far less likely to result in scores of deaths, as evidenced by today's attack in Pennsylvania.

So let's just go ahead and ban guns.