Shanghai's next phase of lockdown starts from Friday in Puxi area for a wider scale of COVID-19 screening of some 16 million citizens in a dozen districts.The city's airports and railway services will keep operating as well as makeshift bus lines and some taxis that have a special pass to pick up passengers.All subway lines in Puxi will be suspended along with other bus lines, taxis and ferry services during the second-phase lockdown scheduled to end on April 5.The city government has initiated an emergency plan to ensure the supply of vegetables for citizens under lockdown and coordinated medical resources to ease the difficulty of going to hospitals, said Ma Chunlei, secretary-general of the Shanghai government.