A stand-off at a Hong Kong university campus has led to fiery clashes overnight, as hundreds of protesters tried to repel a police advance.
Large fires broke out at entrances to the Polytechnic University (PolyU), where protesters hurled petrol bombs and shot arrows from behind barricades.
Officers earlier warned they could use live ammunition if protesters did not stop attacking them using such weapons.
Months of anti-government protests have caused turmoil in the city.
The latest violence is some of the worst the semi-autonomous Chinese territory has seen since the movement began.
The police have become targets for radical demonstrators, who accuse them of excessive force.
Demonstrators have been occupying the PolyU for days. Fresh clashes erupted on Sunday, with tear gas and water cannon being met with petrol bombs, bricks and other improvised weapons.
A police media liaison officer was wounded in the leg with an arrow on Sunday.