UPDATE 3-Hong Kong protesters fire bows and arrows from campus fortress

Hong Kong protesters shot bows and arrows, wounding a policeman in the leg, and hurled petrol bombs from a barricaded university campus on Sunday, with activists braced for a possible final police clearance after fiery clashes overnight.Police fired blue-dyed liquid from water cannon after several protesters fired arrows from rooftops at the Hong Kong Polytechnic University amid some of the most dramatic scenes in over five months of protests in the Chinese-ruled city.