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Pictures | Thu Apr 10, 2014 | 6:14pm EDT

Pennsylvania officials seek motive for school stabbing rampage

Flowers are seen outside the Franklin Regional High School in Murrysville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton

Flowers are seen outside the Franklin Regional High School in Murrysville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton

Flowers are seen outside the Franklin Regional High School in Murrysville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton
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Students hold hands outside the entrance to Franklin Regional High School in Murrysville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton

Students hold hands outside the entrance to Franklin Regional High School in Murrysville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton

Students hold hands outside the entrance to Franklin Regional High School in Murrysville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton
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Brett Hurt, a sophomore at Franklin Regional High School, sits with his mother Amanda Leonard, during a news conference at Forbes Hospital in Monroeville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton

Brett Hurt, a sophomore at Franklin Regional High School, sits with his mother Amanda Leonard, during a news conference at Forbes Hospital in Monroeville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton

Brett Hurt, a sophomore at Franklin Regional High School, sits with his mother Amanda Leonard, during a news conference at Forbes Hospital in Monroeville, Pennsylvania April 10, 2014. REUTERS/Shannon Stapleton
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A still image from video footage courtesy WPXI-TV shows stabbing suspect Alex Hribal dressed in a hospital gown after his arraignment with Sheriff's deputies in Export, Pennsylvania April 9, 2014. REUTERS/WPXI-TV

A still image from video footage courtesy WPXI-TV shows stabbing suspect Alex Hribal dressed in a hospital gown after his arraignment with Sheriff's deputies in Export, Pennsylvania April 9, 2014. REUTERS/WPXI-TV

A still image from video footage courtesy WPXI-TV shows stabbing suspect Alex Hribal dressed in a hospital gown after his arraignment with Sheriff's deputies in Export, Pennsylvania April 9, 2014. REUTERS/WPXI-TV
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An FBI agent enters the family home of a suspect after a series of knife attacks at at Franklin Regional High School in Murrysville, Pennsylvania April 9, 2014. REUTERS/Shannon Stapleton

An FBI agent enters the family home of a suspect after a series of knife attacks at at Franklin Regional High School in Murrysville, Pennsylvania April 9, 2014. REUTERS/Shannon Stapleton

An FBI agent enters the family home of a suspect after a series of knife attacks at at Franklin Regional High School in Murrysville, Pennsylvania April 9, 2014. REUTERS/Shannon Stapleton
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A Murrysville Police vehicle is seen at the family home of a suspect after a series of knife attacks at at Franklin Regional High School in Murrysville, Pennsylvania April 9, 2014. REUTERS/Shannon Stapleton

A Murrysville Police vehicle is seen at the family home of a suspect after a series of knife attacks at at Franklin Regional High School in Murrysville, Pennsylvania April 9, 2014. REUTERS/Shannon Stapleton

A Murrysville Police vehicle is seen at the family home of a suspect after a series of knife attacks at at Franklin Regional High School in Murrysville, Pennsylvania April 9, 2014. REUTERS/Shannon Stapleton
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People leave Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

People leave Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

People leave Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters
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People gather outside of Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

People gather outside of Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

People gather outside of Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters
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A young man speaks to a policeman outside of Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

A young man speaks to a policeman outside of Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

A young man speaks to a policeman outside of Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters
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People gather outside Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

People gather outside Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters

People gather outside Franklin Regional High School after reports of stabbing injuries in Murrysville, Pennsylvania April 9, 2014, in this still image taken from video courtesy of WPXI. REUTERS/WPXI/Handout via Reuters
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