A citywide police search is underway for a knife-wielding man who injured four women in a Hong Kong park on Friday.The four victims were doing morning exercises in the park on Garden Hill, off Tai Po Road, Cheung Sha Wan, around 10.15am.“The culprit first attacked a group of three women with a knife,” a police source said.“While fleeing on foot, he attacked another woman.”Man shot dead by police after knife attack in Yau Ma TeiInitial police examination showed the victims suffered stab wounds…