A young man practices firing a bow and arrow, amid violent clashes at Hong Kong Polytechnic University.<br /><br />In some of the worst violence Hong Kong has seen in its months-long protests, police attempted to clear 'PolyU' with tear gas, armoured cars and water cannon.<br /><br />Protesters responded with petrol bombs, arrows and other missiles, some of them fired from large catapults. At least one police officer was hurt by an arrow.<br /><br />Police have warned they may use lethal force to clear the site.
