Police arrested five people during violent clashes in Mong Kok between localist demonstrators and pro-Beijing groups, Apple Daily reported Monday.
Four men and one woman, aged between 23 and 55, were arrested, and one officer was injured, police said.
Anti-mainland groups, including Hong Kong Localism Power and HK Indigenous, were planning to hold a protest Sunday night against some middle-aged mainland women who regularly assembled in the pedestrian area of Sai Yeung Choi Street South and belted out songs.
The localist groups accused the women of causing a nuisance.
Some patriotic groups, led by I Care Action convener Anna Chan, heard about the plan and arrived to confront the protesters.
Heated verbal arguments escalated into physical clashes between the two sides, of about 40 people each.
Police who had been standing by deployed metallic barricades to try to keep them apart.
As the violence began to get out of control, police started using pepper spray and clubs against some of the combatants.
Video clips posted online by witnesses showed police hitting a female protester on her head.
Several people involved in the fighting were bleeding.
After the five who had been arrested were taken to Mong Kok Police Station, more than 70 localists showed up to demand their release.
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