FLASH: Heckler disrupts Chinese President Hu's speech on south lawn at White House: 'President Bush, stop him from killing'... one cameraman put a hand on her shoulder as she shouted... seemed to be trying to quiet her down... 'Stop persecuting the Falun Gong,' she yelled... She also shouted in Chinese, 'President Hu, your days are numbered'... woman is taken away by uniformed secret service officers... right after Bush urged Hu to allow Chinese to 'speak freely'...