It said relevant district offices will hand out a total of 80,000 test kits to the people living or working at specific blocks in Sha Tin, Southern district, Kwun Tong and Yuen Long.
The buildings concerned include Hill Paramount, Julimount Garden, World-Wide Gardens, Golden Lion Garden Stage II and Lung Hang Estate in Sha Tin, World Fair Court, Wah Fu (I) Estate, Wah Fu (II) Estate and Pok Fu Lam Terrace in Southern District, Tsui Ping (South) Estate in Kwun Tong, as well as Sun Yuen Long Centre and a number of residential blocks near Fung Yau Street North, Fung Yau Street South and Fung Kam Street in Yuen Long.
Those who test positive can call a 24-hour government hotline to get further tests.