Riot police restrained at least 15 people and fired pepper spray in the Hong Kong border town of Sheung Shui on Saturday, after about 100 masked demonstrators gathered in a major mall to protest against so-called parallel traders and shoppers from mainland China. Protesters also gathered on a footbridge between the mall and the MTR railway station, kicking the shopping bags and suitcases of mainland visitors, who fled the scene and left cosmetics and other items behind.