Pennsylvania officials say 19 students and one staff member at Franklin Regional High School in Murrysville were injured in a mass stabbing on Wednesday morning.
At least two students are reportedly in critical condition after the attack in the town, 18 miles east of Pittsburgh.
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Below are initial photos from the scene of the stabbing.
AP
Emergency responders gather in the parking lot of the high school on the campus of the Franklin Regional School District, where several people were stabbed at Franklin Regional High School, on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Gene Puskar)
AP
Emergency responders gather in the parking lot of the high school on the campus of the Franklin Regional School District, where several people were stabbed at Franklin Regional High School, on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Gene Puskar)
AP
Students leave the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Gene Puskar)
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AP
A Salvation Army disaster services vehicle drives past a school bus onto the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School, Wednesday, April 9, 2014 in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Keith Srakocic)
AP
A policeman directs a driver to the area to pick up students on the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Keith Srakocic)
AP
A pair of women walk arm-in-arm off the campus of the Franklin Regional School District, where several people were stabbed at Franklin Regional High School on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Keith Srakocic)
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AP
Students leave the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Gene Puskar)
AP
Jenna Mickel, right, a sophomore at Franklin Regional High School, right, stands with her father, Richard, as she talks with reporters near the school, where several people were stabbed, Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Gene Puskar)
AP
Studentswalk down the street away from the campus of the Franklin Regional School District, where several people were stabbed at Franklin Regional High School, on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Gene Puskar)
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AP
A woman walks onto the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Gene J. Puskar)
AP
Emergency responders gather in the parking lot of the high school on the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Keith Srakocic)