By Emma G. Fitzsimmons and Timothy Williams, New York Times, April 9/10, 2014

As classes began at a high school in suburban Pittsburgh on Wednesday morning, a 16-year-old student walked through the hallway stabbing and slashing students with two large knives, the authorities said.

By the time the student was tackled by an assistant principal, he had stabbed 20 students and a security guard and sent students running from the school, officials said. At least four of the students had serious wounds to the abdomen and torso but were expected to survive.

The suspect, Alex Hribal, was treated for cuts to his hand at a hospital before he was taken into custody. He was charged on Wednesday with four counts of attempted homicide, 21 counts of aggravated assault and one count of possessing a prohibited weapon on school property, according to The Pittsburgh Post Gazette.

The attack at Franklin Regional High School in Murrysville, Pa., a suburb about 20 miles east of Pittsburgh, began shortly after 7 a.m., officials said. The teenager stabbed students with two knives that were 8 to 10 inches long, the police said [....]