Other us agencies believe the virus developed naturally. our north america correspondent john sudworth reports. suspicions have long swirled around wuhan�*s laboratories. now, three years after the start of the pandemic, they've burst into the open once again. the fbi has for quite some time now assessed that the origins of the pandemic are most likely a potential lab incident in wuhan. here you're talking about a potential leak from a chinese government controlled lab that killed millions of americans. from the start, many scientists believed that covid had passed naturally from animals to ...