Mass stabbing

Josh Voorhees has a Slate article about a massacre at a Pennsylvania high school:

A developing (and rather frightening) story out of Murrysville, Pennsylvania, this morning, via the Associated Press:

An official says four students were believed to be seriously injured at a high school near Pittsburgh, where a student with a knife stabbed or slashed others, injuring as many as twenty.
Westmoreland County emergency management spokesman Dan Stevens says not all of the twenty injured were cut by the knife, though most were. Some suffered scrapes and cuts in the mayhem that ensued at Franklin Regional High School in Murrysville. The suspect, a male student, was taken into custody and being questioned.

Obviously, in a developing story like this one there's a lot we don't know, and a lot of what little we think we know right now may very well change as authorities continue to gather information and piece things together. But, as of about 10 am, here is the latest on what authorities believe they know for sure: a male suspect is in custody and is currently being questioned, and the vast majority of the injured were students between the ages of fourteen and seventeen. Other than that, details remain scarce.
The latest details, via NBC News:

At least nineteen students and a security guard were hurt, some with life-threatening injuries. The suspect, a sixteen-year-old sophomore, was in custody and being questioned by police, authorities said. His motive was unclear, said Dan Stevens, a Westmoreland County emergency management spokesman.

The student was “flashing two knives around” as he moved through the classrooms and a first-floor hallway, said Thomas Seefeld, the Murrysville police chief. A school security guard handcuffed the student and suffered a wound to the stomach, the chief said.
It's unclear how serious the injuries are. According to Stevens, it doesn't appear any students suffered life-threatening injuries. That report, however, conflicts with what we're hearing from a local news affiliate in Pittsburgh, which is reporting that at least seven of the injured have life-threatening injuries are being treated at a local hospital.
Murrysville is located about twenty miles east of Pittsburgh, Pennsylvania, and the school district serves 3,600 or so students who live in the surrounding communities of Murrysville, Export, and Delmont. The attack is said to have begun at about 7:20 am, after which the school went into lockdown.

Rico says at least there weren't any gubs involved, right? (Sarcasm intended.)