Shanghai's Fudan University has closed a computer bulletin board where students posted comments on the dispute over the Diaoyu Islands. An official at the university said 'extreme' comments made on-line by students were one of the reasons for the closure of the board at the university's website, but it also needed to be 'restructured'. 'The main reason is the system has trouble handling the huge quantity of messages being posted, but it cannot be denied that there is also a security issue involved,' the official said. 'Some students have made comments which are rather extreme comments, and we naturally have to take this into consideration because the network is connected to the worldwide Internet.' He said it could take a month or more before the board could resume operation. But Internet discussion on the islands yesterday moved to another bulletin board at Fudan, the Free Sign Guestbook. One message read: 'Why has the Fudan bulletin board been closed? Could it be that criticising Japan endangers the leadership position of our party?' A total of eight website servers yesterday signed on to the Guestbook to voice their dissatisfaction. One Hong Kong resident said: 'Protest!!! Protest!!! Protest!!! Why shut down the bulletin board!! It is a moral duty for the Chinese to protect their country. 'We can't let the Japanese occupy one-inch of China's territory.' A writer from Chengdu, with the pseudonym Yiren, said he wanted to be Korean because the Korean people made verbal and military challenges to Japan over the Tok-to Islands - known in Japanese as the Takeshima - a group of islands between South Korea and Japan. A professor at People's University in Beijing said there was no similar closure there, although the university had told students not to protest against the Japanese or boycott Japanese products.