The Centre for Health Protection today said it is investigating 13 additional COVID-19 cases, of which seven are locally transmitted.

Among the local cases, four have unknown sources of infection.

One of the unlinked cases involves a 68-year-old man who lives in Tower 7 of Hong Kong University of Science & Technology Senior Staff Quarters.

The remaining three patients live in Block 10 of City One Shatin, New Lai King Building in San Po Kong and Sau Hong House of Sau Mau Ping Estate.

The six imported cases arrived from Indonesia, Pakistan, and the United Arab Emirates.

Meanwhile, there are more than 10 preliminary positive cases, of which at least nine have unknown sources of infection.

Additionally, seven places including a hotel and a company office are now covered by compulsory testing notices.

People who had been at these premises during specified periods have to undergo testing.

The Government will set up more mobile specimen collection stations on March 3 while the service period of the mobile stations at Maple Street Playground in Sham Shui Po and Sha Tin Town Hall Plaza will be extended to March 7, and that of the station at Edinburgh Place in Central to March 9.

For information and health advice on COVID-19, visit the Government's dedicated webpage.