The legislators chanted slogans and held up placards accusing China's central government of breaking its promise to let Hong Kong directly elect its leader. Some stood on chairs and pumped their fists, waving signs that said "Shameful" and "Loss of faith."
The noisy demonstration at the start of the speech by Li Fei, a deputy secretary general of the Standing Committee of the National People's Congress, China's legislature, was a rare occasion on which a Beijing official faced open defiance.
Police used pepper spray on members of a radical activist group that attempted to storm metal barricades and enter the venue.
Yetsterday, Beijing inflamed political tensions by ruling out open nominations of candidates running for Hong Kong's top job in inaugural elections in 2017. The widely expected announcement set the stage for escalating confrontations between China's central government and democracy supporters in Hong Kong who have pledged to carry out a civil disobedience campaign that could culminate in a mass protest to cripple the city's financial district.