Shanghai will lock down each half of the city in turns to conduct a mass testing blitz to combat a Covid-19 outbreak that has become China's biggest virus hot spot.
The city will first lock down areas east of the Huangpu River, which includes its financial district and industrial parks, for four days starting today.
In The Straits Times' The Big Story, Assistant video editor Olivia Quay spoke to China correspondent Elizabeth Law discusses this development.