Three top Chinese universities have vowed to tighten "ideological" control over students and teachers, as a wider clampdown on free expression in the country intensifies. The comments came from the Communist Party committees of Peking University, Shanghai's Fudan University, and Sun Yat-sen University in Guangzhou, which each wrote a statement in the Communist Party theoretical journal Qiushi. The statement from Peking University -- China's top academic institution -- condemned those with "ulterior motives" who target the ruling party. "In recent years, some people go on the Internet and with ulterior motives add fuel to the fire... ultimately targeting the Chinese Communist Party and the socialist system," it said.