According to the RTHK, a government-backed radio broadcasting service, there was an engage in conflict at around 4pm (0900 GMT), after a group of protesters challenged the plain-clothes officers in the Landmark North plaza in Sheung Shui.
This occurred close to the mainland Chinese border between Hong Kong and Shenzhen.
The Police responded by using batons and pepper spray to subdue them, the report said.
At least 14 people are said to have been detained, in what is the latest bout of violent unrest during protests that have focused on malls across the city.
Police said on Twitter that “masked rioters” were causing a nuisance and had thrown nails into shops, disturbing public order.
The protests are part of a massive pro-democracy movement first sparked six months ago by a now-defunct bill that would have allowed extraditions to China.
In another neighboring shopping mall called Metropolis Plaza, protesters were shouting at shoppers to “go back to the mainland,” RTHK said.
Both malls are popular with day shoppers from mainland China who stock up on goods such as baby formula and medicine.
A heavy riot police presence was reported around the mall and on connecting footbridges, which were partially obstructed by police.
NAN
