Protests in Hong Kong against the government in Beijing have dragged on since June, which demonstrators say has forces them into taking a harder line.

On campuses across the territory, students and others who have joined the protests have set up workshops to produce makeshift weapons and fortifications.

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Under a November full moon, hundreds of young people dressed in black set about turning several of Hong Kong's top universities into fortresses, well stocked with improvised weapons.

At City University, protesters used ping pong tables, potted plants, furniture, sports equipment, and bamboo to form a network of barricades to block roads and fortify the entrances to the student residence complex.

Hundreds of protesters wearing gas masks and helmets tore up piles of paving bricks and ceramic tiles to hurl at police, while others stockpiled dozens of petrol bombs, distributing them to their forward positions.

Small groups sat chatting as they fashioned garden hose and nails into spikes to puncture car tires.

The scene this week was repeated at nearly half a dozen campuses across Hong Kong, where demonstrators say they have been forced into taking a harder line by the government.