Stabbing at Pittsburgh high school leaves at least three injured

Now to breaking news in Pittsburgh where three students are injured after a stabbing at a high school. Police say it happened at Carrick High School and it stemmed from an altercation in the hallway. One student is now in police custody.Here's what one mother had to say about the violence. This happens every single day and just something needs to change, especially in Pittsburgh. Like it's a it's a small city, but we're a family.Everybody knows everybody in this city. Every kid in this school knows what hap ...