Clashes broke out between police and Hong Kong demonstrators Saturday as the latest anti-government protests took aim at traders coming across the border from mainland China. Police used pepper spray and batons against masked protesters in Sheung Shui, a town near the border with China, after thousands marched to complain about "parallel traders". Sheung Shui boasts dozens of pharmacies and cosmetic stores that are hugely popular with mainland merchants who snap up goods in Hong Kong -- where there is no sales tax -- and resell them across the border.