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 Central Intelligence Agency on Saturday said it has shifted its previous assessments and has concluded that it’s likely the Covid-19 virus was leaked from a Chinese lab before it became a global pandemic but added that the agency had “low confidence” in its judgment.