BEIJING (AP) — The capital of China’s Hainan province has locked down its residents for 13 hours as a COVID-19 outbreak grows on the tropical island during the summer school holidays. More than 470 new cases were recorded in the province on Sunday. The temporary lockdown of Haikou city from 7 a.m. to 8 p.m. follows an ongoing and indefinite lockdown of the beach resort of Sanya since Saturday. Some 80,000 tourists have reportedly been stranded in Sanya. Tourists wanting to leave must test negative five times over seven days. China has stuck to a “zero-COVID” approach despite the economic and social costs.