Caution returned to Hong Kong stocks as the city’s benchmark fell from its highest point in three years, with investors gearing up for the US Federal Reserve’s rate decision and earnings reports.The Hang Seng Index fell 0.9 per cent to 25,316.44 as of 10.08am local time on Tuesday, while the Hang Seng Tech Index dropped 1.5 per cent. On the mainland, the CSI 300 Index slipped 0.1 per cent and the Shanghai Composite Index was little changed.Xinyi Solar Holdings slid 3.4 per cent to HK$3.10 and...