A joint WHO-China study on the origins of COVID-19 says that transmission of the virus from bats to humans through another animal is the most likely scenario and that a lab leak is “extremely unlikely”, according to a draft copy obtained by The Associated Press (AP). The findings offer little new insight into how the virus first emerged and leave many questions unanswered, though that was as expected. But the report does provide more detail on the reasoning behind the researchers’ conclusions. The team proposed further research in every area except the lab leak hypothesis.

The report is being closely watched since discovering the origins of the virus could help scientists prevent future pandemics, but it’s also extremely sensitive since China bristles at any suggestion that it is to blame for the current one. Repeated delays in the report’s release have raised questions about whether the Chinese side was trying to skew its conclusions. “We’ve got real concerns about the methodology and the process that went into that report, including the fact that the government in Beijing apparently helped to write it,” US Secretary of State Antony Blinken said in a recent CNN interview. China rejected that criticism on Monday.