Yuzhou: Second Chinese city forced into Covid lockdown

China has put a second city into total lockdown after just three asymptomatic Covid cases were discovered. Yuzhou - which has a population of 1.1 million - saw its transport system shut down and all but essential food stores closed overnight. It follows a similar lockdown in Xi'an, where 13 million have been confined to their homes since 23 December. The strict measures come ahead of the Lunar New Year and the Winter Olympics due to be held in Beijing.