Tempers flared at the City Forum in Victoria Park yesterday over the annual commemoration of the June 4 crackdown. Police intervened when some participants at the weekly forum, sponsored by RTHK, became embroiled in shouting matches. Throughout the hour-long forum, broadcast live, audience members shouted abuse at legislator Szeto Wah, who chairs a pro-democracy alliance branded by Beijing as subversive. Mr Szeto, chairman of the Hong Kong Alliance in Support of the Patriotic Democratic Movement in China, became the target of some speakers on the stage and some critics from the floor for organising the annual activities. A Hong Kong deputy to the Chinese People's Political Consultative Conference, Lee Kwok-keung, claimed documentaries had shown there was no violence in Tiananmen Square. Mr Lee said: 'We have to criticise the bad things in China in a friendly way. For instance, we can criticise their corruption and prostitution harshly . . . but democratic development relies on reform.' Mr Lee suggested Mr Szeto visit China to see for himself the changes in the mainland. But Mr Szeto said mainland authorities had refused to renew his home-return permit, which expired two years ago. He has not been to the mainland since 1989. Dr Thomas Chan Man-hung, head of the China Business Centre of the Hong Kong Polytechnic University, said: 'We can't deny June 4. But nor should we only have hatred towards the [mainland] Government.' Mr Szeto said he did not hate the Government. 'I only have strong love. As I've said for the past 11 years, we, the Chinese, have to fight for mainland democracy and Hong Kong people can also express their opinions. 'We have to shout our slogans. It's better than people keeping silent, forgetting the event and reversing the truth.' Twenty University of Hong Kong students laid a wreath at the Pillar of Shame sculpture on the campus. The students, who were in the late years of primary education or early secondary school when the massacre occurred, also repainted two slogans painted on a pavement in the Pokfulam campus 11 years ago. One said they did not find the memorial activities a mere formality. 'With more discussion, we can keep reminding ourselves and others about the tragedy,' he said. The pillar, carved by Dane Jens Galschiot, honours those who died on June 4, 1989.