Hong Kong placed scores of residential buildings in the densely populated Yau Tsim Mong district under full lockdown before dawn on Saturday in an unprecedented attempt to halt a rapidly spreading outbreak of Covid-19.At 4am, the government declared it would seal off about 200 buildings, affecting tens of thousands of residents, in an area packed with ageing and subdivided flats.The very large area contained several blocks, with Kansu Street in the north, Woosung Street in the east, Nanking…

This post was originally published on South China Morning Post.