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Police were seen patrolling the areas to ensure that the people stay home and do not come out without any emergency.
The lockdown will remain in force for 21 days.
Besides, the local administration has launched a hotline number 333 for delivering daily essentials, food and medicine at the door steps of the people living under red zone areas.
Earlier, on Tuesday, the local administration declared some areas in Kushita and Bheramara municipalities as red zone and decided to put those areas under lockdown.
Read Also: Parameters set for red, green and yellow zones
So far, 273 Covid-19 patient have been identified in the district while 71 made full recovery from the highly contagious virus and one Covid-19 patient have died .
Bangladesh reported its first coronavirus cases on March 8 and the first death on March 18. Although initially the number of confirmed cases was low, they shot up once tests were increased.
On Wednesday, the health authorities confirmed the detection of 4,008 new patients in the span of 24 hours, increasing the total number of cases to 98,489.