Hong Kong authorities barred high-profile pro-democracy activist Joshua Wong from an election, and the city's leader ruled out political solutions before the end of the violent protests gripping the semi-autonomous Chinese territory.
The developments are likely to further widen divisions in Hong Kong, which has been wracked by more than four months of unrest driven in part by demands for political reform.
Hong Kong's leader, Carrie Lam, also warned that the Asian financial hub was on the brink of an economic recession.
A returning officer notified Mr Wong his nomination as a candidate in next month's elections was ruled invalid, according to a copy of the letter Mr Wong posted on his Twitter account.
Pro-democracy activist Joshua Wong was a leading figure in previous Hong Kong protests. Source: AP
"The decision to ban me from running for office is clearly politically driven," he said.
He said Beijing was pressuring Hong Kong election officials to carry out political screening but it would backfire.
"It will just trigger more and more Hong Kongers to take to the street and also vote in the election."
Mr Wong, 23, became known as the young face of Hong Kong's "Umbrella Movement" that peacefully occupied streets for 79 days in 2014, and he has since been repeatedly arrested and jailed.
He has been less important to the current protest movement, which has been leaderless and whose participants have sought to remain anonymous.
His activities have nonetheless made him a target of China's communist leaders, who have used him to accuse foreign powers of colluding with anti-China separatists to foment unrest.
Hong Kong's leader Carrie Lam has warned about the risk of recession in the city. Source: AP
The government confirmed Mr Wong's disqualification, without identifying him.
The returning officer said in the letter that Mr Wong's embrace of the concept of self-determination includes Hong Kong's independence, which goes against a requirement to promise to uphold its constitution.
But Mr Wong denied that, saying his answers to the officer's questions were twisted.
Mr Wong and other pro-democracy activists were disqualified from running in previous elections.
But the others have been approved for the November 24 local district council elections, making him the only one to be banned.
Neighborhood councilors and half of Hong Kong's legislature are directly elected, but the rest are chosen by trade and industry groups while the top leader is handpicked by an elite pro-Beijing panel.
The protesters' demands include full democracy.
The disqualification came as Ms Lam ruled out finding a political resolution before ending protest violence.
The city of Hong Kong has been wracked by two months of protests fuelled by growing political unease. Source: AP
"For the government to resort to measures that will appease the violent rioters, I don't think that is the solution," she said.
"Until and unless we tackle the violence and put an end to it, it is very difficult to continue the political dialogue we have done," Ms Lam said.
Hong Kong has been gripped since early June by the political crisis, with peaceful but often unauthorized marches descending into chaos as hardcore demonstrators hurling fire bombs and bricks battle police firing tear gas,
rubber bullets and water cannon.
Both sides blame each other for using increasingly aggressive tactics.
Ms Lam said the city is at risk of falling into a recession as it enters its fifth month of protests, which has punished the city's tourism and retail industries.
"If this quarter's growth rate, compared to the second quarter's growth rate, is negative, it will be the second decline in a row. Then it can be said that we have entered a technical recession."
