Authorities have launched a search for a 52-year-old man missing on Hong Kong's Lantau Island after he failed to return from a hike. The search is complicated by the year's highest temperatures.

Hong Kong authorities launched a search on Thursday for a 52-year-old man who failed to return home after setting out on a hike on Lantau Island the previous day, when the city recorded its highest temperature of the year. The man left home on Wednesday morning, telling his family he planned to tackle section 8 of the Lantau Trail, which connects Shek Pik Reservoir with Kau Ling Chung on the southern part of the outlying island. But he did not return overnight, prompting his wife to call the...