Bullying! Is it the School's Responsibility???

Is it the school's responsibility to crack down on bullying when it reaches a certain point where that child can unbear?
On January 14, 2010, a fifteen year old girl by the name of Phoebe Prince, student of South Hadley High School, committed suicide, by hanging herself in the staircase of her parents apartment, which was discovered by her younger sister. Nine teenagers were charged with connection of this suicide due to a 3-month period of bullying that included sexual harassment, taunting, physical and emotional abuse, and online bullying. Two males, by the ages of 17 and 18 were also charged with statutory rape.
On the day of her death, she was bullied in the school library, which was witnessed by a faculty member and other students but wasnt reported until after Phoebe's death. The Northwester District Attorney, Elizabeth Scheibel, said it was "common knowledge" that Phoebe was being bullied on a regular basis for the 3-month period.
Does it take a child's death to realize that bullying is a crime and should be taken seriously? Parents and other adults are an important factor in preventing this from happening in the future. Just by noticing signs of their child/student being bullied or being the bullier. Children that are being bullied can be stunted physically, emotionally and academically. According to safeyouth.org, "almost 30 % of youth in the US (or over 5.7 million) are estimated to be involved in bullying or either a bully, a target of bullying, or both. In a recent national survey pf students in grades 6-10, 13% reported bullying others, 11% reported being the target of bullies, and another 6% said that they bullied others and were bullied themselves".
Is it the schools fault for not taking action sooner? Is it the parents fault for not taking notice in their childs behavior patterns when being bullied or being the bullier?