Hong Kong police have charged seven officers with harming a pro-democracy protester who was beaten in a filmed confrontation that stirred outrage among the city's residents.

A police spokeswoman said Thursday the seven officers were charged jointly with one count of grievous bodily harm. One was also charged with common assault. They're due in court Monday.

The spokeswoman provided information on condition of anonymity following office practice.

The activist, Ken Tsang, said police informed him he should also expect to be arrested.

The charges are being laid exactly one year after the incident, which occurred at the height of pro-democracy protests that gripped the city for months.

During a confrontation between protesters and authorities outside government headquarters, the officers were filmed kicking a handcuffed Tsang in a dark corner.