China placed a city of four million under lockdown on Tuesday in a bid to stamp out a domestic coronavirus spike, with residents told not to leave home except in emergencies. The restrictions came as China reported 29 new domestic infections -- including six cases in Lanzhou, the provincial capital of northwestern province Gansu.Officials in Lanzhou said the "entry and exit of residents" would be strictly controlled and limited to essential supplies or medical treatment."All types of residential communities are to implement closed management," authorities said in a statement.

China placed a city of four million under lockdown on Tuesday in a bid to stamp out a domestic coronavirus spike, with residents told not to leave home except in emergencies. The restrictions came as China reported 29 new domestic infections -- including six cases in Lanzhou, the provincial capital of northwestern province Gansu.Officials in Lanzhou said the "entry and exit of residents" would be strictly controlled and limited to essential supplies or medical treatment."All types of residential communities are to implement closed management," authorities said in a statement.