An independent inquiry was needed to dig out the truth of the June 4 massacre, speakers at RTHK's City Forum said. Szeto Wah, chairman of the Hong Kong Alliance in Support of the Patriotic Democratic Movement in China, suggested establishing an investigative team under the United Nations. 'History cannot be concealed. The families of those dead must be consoled,' he said. Cheung Ka-man, member of the Chinese People's Political Consultative Conference (CPPCC), and Frederick Fung Kin-kee, chairman of the Association for Democracy and People's Livelihood, shared Mr Szeto's views. But another CPPCC member, Lee Kwok-keung, said the time was not right. He said the military crackdown was correct and added that the US had interfered in the student movement. 'Officials of the United States have proved it and the Voice of America also said the US did interfere.' Professor Joseph Cheng Yu-shek of City University said Mr Lee's opinion was an insult to the intelligence. 'Could the US Government use a few million dollars to encourage so many students to protest against the Government?' he asked. Security at Victoria Park was tight. Last week, Wong Kam-chau of the Chinese University was attacked when criticising the Government's attempt to seek a reinterpretation of the Basic Law on right of abode.