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Several students were stabbed on Wednesday morning at Franklin Regional High School in Murrysville, Pennsylvania, by an unidentified student who is in custody, according to multiple reports. The Pittsburgh-area school opened its doors for the beginning of the school day about 15 minutes before the first report of injuries, according to NBC News

Thomas Seefeld of the Murrysville Police Department said in a Wednesday press conference that the unnamed male suspect used two knives in the attack, and that the suspect was taken into custody after making contact with the principal of Franklin Regional High School, who helped to subdue him. The suspect is 16 years old, and no charges have been filed against him at this point. There's no word on his motive.

According to Dan Stevens with Westmoreland Emergency Management, at least 20 people were stabbed or otherwise injured in the incident, four of them seriously.  Later on Wednesday morning, the CEO of Forbes hospital confirmed to WTAE that it was treating 8 victims — seven students and one adult — of the 20 total. Half of those at Forbes had what were characterized as "life threatening" injuries, although all are expected to survive their injuries. That's in part thanks to the efforts of one student at the scene: 

Ten other students were hospitalized at other nearby hospitals, WTAE added, but there's little information on their status. The injured include 19 students and one guard, according to CBS news. 

One student gave a short, albeit unconfirmed, account of the incident to WTAE

A student reported that someone came into the school with a knife and started slashing people, including some of his friends. That information has not been confirmed by police.

And there are several unconfirmed reports circulating about one student, who took what appears to be a selfie of himself in the hospital recovering from his wounds. According to witness accounts – again, unconfirmed by police — Scimio alerted his classmates to the danger: 

According to WTAE, school has been cancelled for the day following the incident, and officials are working on a plan to get send students back home.  An emergency message on the school district's website reads: 

A critical incident has occurred at the high school. All elementary schools are cancelled, the middle school and high school students are secure. Additional information will be released as soon as possible. Please keep our campus clear of traffic.

Here's a livefeed from a local station, for the latest:

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