HONG KONG—Tens of thousands of antigovernment protesters rallied on Sunday as a movement that began six months ago shows no signs of waning, with pro-democracy demonstrators and the Beijing-backed Hong Kong government offering no hint of compromise.

Under the watch of police in riot gear, many black-masked protesters said they were there to rebuke Hong Kong Chief Executive Carrie Lam for failing to respond to the message sent by the landslide victory for pro-democracy candidates in district elections two weeks ago, when pro-establishment…

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