Hong Kong stocks ended its Monday morning session at 25,234.75 points, dropping 829.36 points, or 3. 18 percent, led by Greece's debt crisis.

Greeks voted overnight to reject demands by international creditors for more austerity measures, leading to worries that financial crisis be triggered in the country.

The benchmark Hang Seng Index once fell 957 points, or 3.67 percent, to 25,189 during the morning session.