From the Christian Science Monitor:
Now, after three weekends of angry anti-Japanese street protests, authorities in Beijing appear to have decided that the largely student-led campaign to target Japanese businesses and diplomatic buildings may be harming China’s image abroad and creating tensions in the region – and could pose a domestic challenge if sentiments among Chinese ever became unmanageable.
Chinese diplomats have refused to apologize to Tokyo for protests that have caused many Japanese to cancel vacations in China and have upset business leaders in Tokyo. But Beijing has put the word out strongly through party circles to urge quiet and enforce calm.
See also “China and Japan: Managing unrest” from the Economist, and “Ross Terrill: China’s hardly in a position to lecture Japan” from the Australian.