Multiple people were stabbed at a high school in the suburbs east of Pittsburgh, officials said.
Emergency management spokesman Dan Stevens said four students were believed to be seriously injured when a student with a knife stabbed or slashed others, injuring as many as 20.
Stevens said not all of the 20 injured were cut by the knife, though most were. Some suffered scrapes and cuts in the mayhem that ensued at Franklin Regional High School on Wednesday morning. Stevens says it doesn't appear any students suffered life-threatening injuries.
While Stevens said all the injured are between 14 and 17 years old, hospital officials told CBS Pittsburgh the patients they were taking in from the incident range from 15 to 60 years old.
The suspect, a male student, was taken into custody and being questioned. Stevens says the suspect used a knife, though he didn't say what kind or why he attacked the others.
The incident occurred around 7:13 a.m.
Three air medical helicopters have been dispatched to the scene as well as dozens of ambulances.
According to a witness, the stabbings happened in the science wing of the building.
Franklin Regional school district has canceled all elementary classes and say that high school and middle school students are secured.
Stay with us for updates.