Police used batons and pepper spray against protesters shielding themselves with umbrellas on a normally busy main road in the bustling Mongkok district, but were forced into a partial retreat as the sun began to rise, to cheers from the crowd.
Activists rushed to rebuild makeshift barricades in an area police had opened to traffic 24 hours earlier, while thousands of others staged a sit-in at the protest camp that has existed for nearly three weeks, according to an AFP reporter at the scene.
It was the third consecutive night that violence has broken out after a fortnight of comparative calm -- a development that risks sinking only recently resurrected plans to hold talks between student leaders and the city's Beijing-backed authorities.
Hong Kong police commissioner Andy Tsang told reporters today the force had been tolerant since the rallies began in hopes that the protesters would "calm down".
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"Unfortunately these protesters chose to carry on with their unlawful acts, including acts which are even more radical and more violent," Tsang said.
Protesters have held sit-ins at three major intersections causing significant disruption to a city usually known for its stability, and presenting Beijing with one of the most significant challenges to its authority since the 1989 Tiananmen protests.
China has insisted that whoever stands to replace Leung in 2017 elections must be vetted by a committee that is expected to be loyal to Beijing, a proposal protesters have dismissed as "fake democracy".