The district administration here on Sunday put the district under lockdown to prevent the spread of coronavirus.   Deputy commissioner Abdul Ahad made the announcement in the afternoon.   All the emergency services will remain out of the purview of the restriction, he said.     Bangladesh on Sunday recorded the highest number of coronavirus cases in a day as 139 more people tested positive for the virus,   raising the total number to 621.    Besides, four more people died from the disease in the last 24 hours, raising the death toll to 34.