As many as 20 students were stabbed at a high school in the U.S. state of Pennsylvania, authorities said Wednesday.
One suspect believed to be a student is in custody at Franklin Regional High School in a suburb of Pittsburgh, a local affiliate of ABC News reported.
An official said four students were believed to be seriously injured.
Westmoreland County emergency management spokesman Dan 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, AP reported.
Stevens said it doesn't appear any students suffered life-threatening injuries. He says all the injured are between 14 and 17 years old.
Stevens said the suspect used a knife, though he didn't say what kind or why he attacked the others.
"A critical incident has occurred at the high school. All elementary schools are cancelled, the middle school and high school students are secure," school officials wrote in a bulletin following the incident on Wednesday morning.
Television images of the scene showed students standing in groups outside the school with ambulances nearby.
It wasn't immediately clear if the suspect and the victims are students, adults or a mix of both. It doesn't appear that any of the victims suffered life-threatening injuries, Stevens said, though several helicopters were seen flying people from the scene to area hospitals.
School officials and Murrysville police didn't immediately return calls seeking further details, but the school issued a bulletin on its website saying: "A critical incident has occurred at the high school. All elementary schools are canceled, the middle school and high school students are secure."
The district serves about 3,600 students who live in the bedroom communities of Murrysville, Export and Delmont. The elementary and middle schools are part of the same campus.
The high school was on lockdown, and students were being kept there as a precaution as school and law enforcement officials double-checked the premises. School officials were making arrangements to bus the middle school students home.
District Attorney John Peck said he was monitoring the situation. Detectives from his office were also investigating, though Peck said he had no information beyond that being reported by Pittsburgh television news stations.
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