Terrified children screamed "mummy" and banged on windows for help after two pupils were stabbed , according to locals. Officers raced to Kingsbury High School in Brent , north west London, after a 13-year-old pupil allegedly stabbed his classmates. Police arrested the teenager after he fled the scene on Tuesday. Counter-terror police have now taken over the investigation with the two victims, aged 12 and 13, remain in a serious condition in hospital. It is understood one was stabbed in the