MALVERN, ENGLAND - SEPTEMBER 08: West Mercia Police officers gather at the gates of The Chase Technology College in Malvern after a pupil and a teacher were attacked by another student at the school on September 8, 2014 in Malvern, England. A 13-year-old boy, who fled the scene, is being hunted by police who have warned that he should not be approached. (Photo by Matt Cardy/Getty Images)
