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An ex­pert group charged by the World Health Or­ga­ni­za­tion to in­ves­ti­gate how the COVID-19 pan­dem­ic start­ed re­leased its fi­nal re­port Fri­day, reach­ing an un­sat­is­fy­ing con­clu­sion: Sci­en­tists still aren’t sure how the worst health emer­gency in a cen­tu­ry be­gan.

At a press brief­ing on Fri­day, Ma­ri­etjie Ven­ter, the group’s chair, said that most sci­en­tif­ic da­ta sup­port the hy­poth­e­sis that the new coro­n­avirus jumped to hu­mans from an­i­mals.

That was al­so the con­clu­sion drawn by the first WHO ex­pert group that in­ves­ti­gat­ed the pan­dem­ic’s ori­gins in 2021, when sci­en­tists con­clud­ed the virus like­ly spread from bats to hu­mans, via an­oth­er in­ter­me­di­ary an­i­mal. At the time, WHO said a lab leak was “ex­treme­ly un­like­ly.”