The CIA now believes the virus responsible for the COVID-19 pandemic most likely originated from a laboratory.

A newly declassified report, released by the CIA on Saturday, is once again stoking the debate around the origins of SARS-CoV-2, the virus behind COVID-19. The report is not based on any new intelligence and was completed under the agency’s previous leadership at the request of the Biden administration.

Since COVID-19 first took off, political leaders, infectious disease specialists, and the lay public have debated its origins. Eventually, two hypotheses emerged: Either the virus crossed over from animals to humans in a wet market in Wuhan—the city in which the disease first appeared—or it leaked from a Chinese lab,