Hundreds of social workers marched to the Wan Chai police headquarters on Wednesday hours after officers brutally beat one of their own during an early-morning operation.
The marchers, estimated at more than 500, staged a sit-in outside the building, defying orders to leave.
They were later allowed to enter in small groups to file a police report about the incident.
A video aired by local broadcaster TVB Wednesday appeared to show police officers beating a man in a dark corner during a 3 a.m. road-clearing operation marred by violent clashes.
The victim was identified as Ken Tsang Kin-chiu, a social worker and a member of the Civic Party.
In the footage, six officers are shown taking him away to a dark corner near the site of scuffles between protesters and the police.
They are shown kicking the man and hitting him with truncheons.
Leung King-man, a council member of the Hong Kong Social Workers General Union, said Tsang had his hands tied with a tape behind his back when the beating occurred.
He called on his colleagues to suspend joint activities with the police until an investigation has been completed.
The union demanded the arrest of the policemen involved in the incident.
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