Tens of thousands in Hong Kong commemorate Tiananmen Square massacre

Hong Kongers commemorate the Tiananmen Square massacre of June 4, 1989.

Hong Kong (CNN)Tens of thousands of people in Hong Kong attended events across the city Saturday to mark the 27th anniversary of the Tiananmen Square massacre in China, amid a split in the pro-democracy movement that could radically transform the city's politics.

Leading student groups boycotted the decades-old candlelit vigil held in Victoria Park, over complaints the event has become "rigid" and too focused on Chinese issues, rather than advancing democracy in Hong Kong. One group even denounced the vigil organizers -- members of the Hong Kong Alliance -- as "pimps in a brothel."