According to the Delhi government, the three locations in the West districts were -- in and around the area of B-333, Hari Nagar; in and around the area of C-785, third floor, camp-2, Nangloi; and in and around the area of RZ-168, K2 Block, Nihal Vihar.
The administration has also sealed Gali numbers 26, 26B, 27 and 27B, Tughlakabad Extension in the South-East district. In the South district, the area around house number 859/20, L-II, Sangam Vihar has been sealed.
In Sangam Vihar, four COVID cases were reported from one house. According to official sources, a 57-year-old man traveled to the Nizamuddin Markaz -- which was also one of the Coronavirus hotspots in the city -- and was tested positive on April 7.
"Later, three more, brought to the institutional quarantine, tested positive...The larger area was contained, not leaving any scope for the virus spread," an official said. Among the districts, the highest containment zones are in the South East District with 16 such zones; followed by the West district with 11 red zones.
The containment zones are announced by the district administration after three or more COVID cases were found in an area.
On Thursday, three areas were made containment zones. While two red zones were announced on Wednesday, nine new containment zones were announced on Tuesday and four on Monday. On Sunday, 10 new red zones were announced.
After the administration seals an area naming it 'containment zone', the Delhi government starts 'Operation SHIELD' in the area.
The Operation SHIELD -- Sealing, Home Quarantine, Isolation and Tracking, Essential Supply, Local Sanitisation, and Door-To-Door Checking -- is used to control the spread of the virus, the Delhi Health Department said.
Delhi government's 'Operation SHIELD' has completely stopped the transmission of coronavirus in Dilshad Garden, Old Seemapuri, and in three locations in the East district with no new cases reported in the last two weeks.
On March 26, J and K, L and H pockets of Dilshad Garden and G, H, J, Blocks, old Seemapuri became the first two containment zones of the city. Also, the administration claimed that no new cases were reported in the containment zones in Vasundhara Enclave, Mayur Vihar and Khichripur.
The containment zones -- created to map the local transmission of the disease and prevent the contagion from spreading -- are announced by the office of the district magistrate. It completely shuts the movement of the common people with the authorities taking care of the essential supplies.
The area and the houses in it are sanitized properly. Delhi has reported 1,650 cases and 38 deaths related to COVID-19 so far.