Students go back to school in a Guangzhou district

All buses and subway services will be suspended in the subdistricts with temporary control measures in force, according to the local health authority.

The city reported 50 new locally transmitted confirmed cases and 21 asymptomatic carriers on Sunday, the authorities said.

"The current situation of epidemic prevention and control in the city is still complicated, as the number of new daily cases remains at a high level and the risk of transmission in communities still exists," said Lin Hancheng, a senior official with the Shenzhen health commission.