It looks likely to me that it was a US government funded project, outsourced by Peter Daszak of Ecohealth Alliance (New York), to Wuhan Institute of Virology. Some of the work was being done under merely Biosafety Level Two. The Chinese government is certainly obstructing investigation, but so is Daszak, who has a copy of the vital genetic database but refuses to publish it:
Scientific arguments:
https://thebulletin.org/2021/05/the-origin-of-covid-did-people-or-nature-open-pandoras-box-at-wuhan/
Political wrangling and evidence of possible cover-up:
This has been discussed on the Origins of SARS cov2 thread started by SA.
The US and Chinese governments sling mud at each other because both were responsible.