UPDATE 6-Hong Kong campus protesters fire bows and arrows, set fires

Hong Kong protesters shot bows and arrows and hurled petrol bombs from a barricaded university campus on Sunday, as police charged and charged again, firing tear gas and blue liquid from water cannon after fiery clashes overnight.Several protesters fired arrows from rooftops at the Hong Kong Polytechnic University amid some of the most dramatic scenes in over five months of unrest in the Chinese-ruled city.