Disqualified candidates included activist Joshua Wong, some members of the Civic Party and others who won an unofficial primary vote held by the opposition camp earlier this month.
China's ambassador to the United Kingdom said Beijing would use its power to quell Hong Kong protests if the situation deteriorates further.
The US president linked a humane resolution to anti-Beijing protests to China trade deal in tweets as Hong Kong activists plan more mass rallies this weekend to show their movement maintains public support despite disruptive sit-in at the airport.
Three protest leaders were given 16 months, one of them suspended for two years, two received eights months in prison and two were given suspended eight-month sentences on charges of public nuisance offenses.
In a summary of his judgement, Justice Johnny Chan noted that while the concept of civil disobedience is "recognised in Hong Kong", it wasn't a defence to a criminal charge.
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