China locks down city of 4m people after six Covid cases detected
Residents in Lanzhou, Gansu, told to stay at home as buses, taxis and key rail routes suspended
China has placed a city of 4 million under lockdown in an attempt to stamp out a domestic coronavirus outbreak, with residents told not to leave home except in emergencies.
Beijing imposed strict border controls in the weeks after Covid-19 was first detected in China in late 2019, slowing the number of cases to a trickle and allowing the economy to bounce back.
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