The authorities said on Monday that dozens of people were injured in Hong Kong during a chaotic weekend of anti-government protests, leaving a man in a critical state. China called for a tougher stance to end the months of unrest.

Police said 12 policemen were injured during the weekend clash and more than 300 14-54-year-olds were arrested between Friday and Sunday.

Chinese state media on Monday called for tougher action against protesters, who destroyed local offices of state-owned Xinhua News Agency and other buildings, saying violence has undermined the rule of law in the city.

"We really see people are very concerned. They don't know what will happen tonight or next weekend. Pro-democracy lawmaker Charles Mok said.

More than 100 demonstrators, some wearing masks that are now banned, returned to the mall on Monday night, where a man cut a few people with a knife on Sunday and bit the politician’s ears and was beaten by demonstrators.