HONG KONG, March 15 (Xinhua) -- Hong Kong's Hang Seng Index fell 600 points or 3.07 percent to open at 18,931 points on Tuesday.
The benchmark Hang Seng Index extended losses after opening on Tuesday morning, slumping more than 800 points, or 4.5 percent.
The tech index tumbled 220 points or 5.83 percent. Technology stocks were down with Alibaba sinking more than 9 percent and Tencent losing more than 5 percent.