The last band of anti-government protesters trapped inside a besieged Hong Kong university were weighing a narrowing range of options early on Wednesday as police outside appeared ready to simply wait them out.

Witnesses said fewer than 100 protesters remained inside the Hong Kong Polytechnic University after more than 1,000 were arrested since late Monday.

Some surrendered, while others were caught during escape attempts that included trying to clamber down ropes onto waiting motorbikes. Some protesters resurfaced inside the campus after unsuccessfully probing the sewers for a way out during the night. It was unclear if any had managed to escape that way.