Mass Stabbing

These don't tend to make the news in America, but they do happen.  From the March 15, 2012 Washington Post:

COLUMBUS, Ohio — A man accused of stabbing four people at a downtown office building before he was shot on the street by a police officer has been charged with four counts of felonious assault, authorities said Thursday.

John W. Mallett was armed with three knives when he entered a downtown office building that housed a career college and other offices Wednesday afternoon and stabbed four men, the first an employee of Miami-Jacobs Career College, police said. Other people intervened and took away a knife the man was using but didn’t realize he had others, police said.

Like most such attacks:

An aunt in Columbus reported to police that she thought the suspect was Mallett, Weiner said. She told police he was mentally ill and had been off his medications.