[youtube]http://www.youtube.com/watch?v=ZB9F0I72ZUI[/youtube] Footage has emerged of 30 schoolchildren attacking two police officers outside a New Cross school in south London. The 'truly shocking' incident was recorded outside the school after a group of children gathered to watch a fight between two girls. The uniformed officers were both injured after being kicked and punched by the mob. The officers were searching for a man with a knife when the attack occurred.