UPDATE: FBI Searching For Motive Behind School Stabbing - Northern Michigan's News Leader

UPDATE: FBI Searching For Motive Behind School Stabbing

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UPDATE: April 10

The FBI is searching for a motive, going through the Pennsylvania school stabbing suspect's home, cell phone, along with his personal computer and his parents' computer.

16-year-old Alex Hribal is accused of attacking 21 fellow students and a security guard at Franklin Regional Senior High School.

Hribal has been charged as an adult. He's looking at charges including attempted homicide and aggravated assault. 

His lawyer says the teen is a well liked student, and was not considered a loner.

"I've heard these rumors about being bullied. I don't believe that's true.  We're going to figure out what happened here, obviously there is a problem, you just don't leave and go to school and do what he did yesterday," said Patrick Thomassey, Hribal's attorney.

At least two students are still on ventilators. 

 Hribal is being held without bail. 

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April 9

Pa. (AP) -- The teen accused of stabbing multiple people at a Pennsylvania school has been charged. 

Police have increased the number of people stabbed or slashed in the school attack. 

Police say 22 people were hurt in the incident at Franklin Regional High School in Murrysville. 21 of the victims were students and one victim was school police officer.  

Seven teens and an adult are being treated at a local hospital, and a doctor says some of the injuries are "clearly life threatening." The teens had stab wounds to their torsos, abdomen, chest and backs. 

At least five of the student victims were in critical condition. Doctors expect all victims to recover. 

Some of the injured were not stabbed. The emergency manager says some people suffered scrapes or bruises in the chaos.

The suspect, 16-year-old Alex Hribal, was arrested and charged as an adult on 4 counts of attempted homicide and 21 counts of aggravated assault.

Stay with 9&10 News for continuing coverage and latest developments on this stabbing.