Up to 22 people stabbed at Pennsylvania high school

Up to 22 people stabbed at Pennsylvania high school
An attacker armed with two knives has gone on a rampage at a high school in the US state of Pennsylvania, stabbing 21 students and a security guard. A suspect, named as Alex Hribal, 16, was arrested at Franklin Regional High School in Murrysville near Pittsburgh, police said. He was later charged with four counts of attempted homicide and 21 counts of assault.