The Hang Seng Index fell 17 points, or 0.08 percent, to open at 23,240 points on Thursday.

Mainland markets opened higher, with the benchmark Shanghai Composite Index up 0.01 percent to open at 3,340 points.

The Shenzhen Component Index opened 0.03 percent higher at 10,006 points.

Elsewhere, Asian shares advanced and US futures jumped after a US federal court blocked US President Donald Trump from imposing sweeping tariffs on imports under an emergency-powers law. (Agencies)