The 18-year-old Wong and another student leader, Lester Shum, were taken into custody yesterday as authorities moved in to clear the pro-democracy camp in the district of Mongkok, scene of some of the most violent clashes in nearly two months of rallies.
Wong, a key figure in the movement that has paralysed parts of the southern Chinese city, was charged with obstructing the work of police officers and released on bail today.
"This caused injury marks to my neck and face and they consecutively, six to seven times, tried to hurt my body including my private parts," he said.
Shum, 21, also alleged police had used violence when arresting him.
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"They had used fists to punch and feet to kick my body in the process. They had used their knees to bump me and kicked me in the waist," Shum, who like Wong was released on bail late today, said.
News footage of the arrests did not appear to show the pair resisting.
Some 150 protesters were taken into custody when authorities tore down barricades and tents in Mongkok, one of three main protest sites, in a major blow to the movement.
Wong said he has been banned from the area for two months as part of his bail conditions.
"I can't go to the Mongkok area before January 14. I feel mystified," he said.
His lawyer Michael Vidler told the court that the "motivation for this prosecution is political".