Authorities in Hong Kong have expressed concern to the Japanese consulate after a resident was struck on the head with a beer bottle in Sapporo, urging Tokyo to better protect visitors from the city. Thursday’s statement followed a warning issued a day earlier by the Chinese consulate in Sapporo advising nationals against travelling to Japan, at a time when relations between Beijing and Tokyo are at a low point. However, local tour operators said the attack was likely to be an isolated incident...