AP PHOTOS: Hong Kong's June 4 candlelit vigil over the years

HONG KONG -- For decades, Hong Kong has been one of just two cities in China allowed to mark the bloody crackdown on pro-democracy protesters in Beijing’s Tiananmen Square. In 1989, hundreds of thousands of protesters gathered in the square calling for democracy, less censorship and greater freedom of speech. On June 4 that year, China’s military converged on the square with orders to clear it out, opening fire and arresting protesters. Estimates of the number of people killed range from hundreds to several thousand. China’s official verdict is that the largely peaceful protests aimed to topple the ruling Communist Party and plunge the country into chaos. China has censored any mention of the event online.