The Central Intelligence Agency said Saturday that it’s more likely a lab leak caused the Covid-19 pandemic than an infected animal that spread the virus to people, changing the agency’s yearslong stance that it couldn’t conclude with certainty where the pandemic started.

The CIA now believes the virus responsible for the COVID-19 pandemic most likely originated from a laboratory, according to an assessment released Saturday that points the finger at China even while acknowledging that the spy agency has “low confidence” in its own conclusion.