LEADERS of the April 5 Action Group vowed yesterday to challenge the Public Order Ordinance if it is amended after the handover. The group's spokesman, Leung Kwok-hung, said that he would not be bound by any redrafted Public Order Ordinance that required protesters to apply to police before holding demonstrations. 'The amended Public Order Ordinance obviously is the central Government's way to tighten her control over Hong Kong . . . it will strongly undermine people's freedoms and rights to protest,' Mr Leung said. Unless it was a very big demonstration, he said he would not notify the police as required by the new law. 'I believe under the present system we have enough ordinances to safeguard people's safety. We don't need an extra ordinance,' he said. Mr Leung was speaking after a march from Causeway Bay to the Xinhua office in Happy Valley to commemorate the 21st anniversary of the April 5 Tiananmen incident after the death of premier Zhou Enlai. About 30 protesters called for the release of all dissidents and for the central Government to reverse its verdict on the June 4 massacre. Members of the Hong Kong Alliance in Support of Patriotic Democratic Movements of China told people to continue to commemorate the June 4 massacre this year in Victoria Park. A statue depicting the goddess of democracy was erected at the clock tower in Tsim Sha Tsui as the alliance recalled those who sacrificed their lives for democracy in China.