The capital of China’s Hainan province has locked down its residents for 13 hours on Monday as a Covid-19 outbreak grows on the tropical island during the summer school holidays.

The lockdown of Haikou city from 7 am to 8 pm follows an indefinite lockdown of the beach resort of Sanya since Saturday - which is confining vacationers to their hotels for a week - and lockdowns that started in four other cities in Hainan on Sunday.