Hong Kong stocks declined on Tuesday on China's dispute with Japan over Senkaku/Diaoyu islands. The largest China's cities witnessed protests that turned to violence directed against Japanese businesses. Moreover, weakness of the commodity markets weighted down on the Hong Kong blue chips index. The Hang Seng Index lost 0.27% to close at 20,601.93. Only two business sectors included in the index advanced. The top-performers were telecommunication companies. China Unicom Hong Kong added 0.91%. At the same time, basic materials and oil and gas companies pushed the Hang Seng index lower. Aluminum Corp of China, CNOOC and PertoChina slid 3.60%, 1.36% and 0.40%, respectively. Meanwhile, lenders also moved lower, with Bank of China and Bank of Communications slumping 0.34% and 0.58%.