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Hi,  its extremely unlikely that its biological weapon- there have been various papers that have confirmed its not man made, and is just a result of  evolution  ( references: https://www.medicalnewstoday.com/articles/the-new-coronavirus-was-not-genetically-engineered-study-shows   https://www.nature.com/articles/s41591-020-0820-9).   First link is a newspaper article which summaries the  scientific paper in the 2nd link) 

I know its rapidly spreading and its causing massive uncertainty and fear, but there's no reason to  go to wild conspiracy theories just yet.   As for the drones being used- where has that been happening? 

@gillian72   If by day one you mean day one of the lock-down-  its entirely possible that people had  caught the virus prior to the lock-down but not  displayed symptoms as the virus was still in its incubation phase, and then over the next 2-14 days whilst they stayed home,  the virus became active and then those affected had symptoms.