A small group of scientists and others who believe the novel coronavirus that spawned the pandemic could have originated from a lab leak or accident is calling for an inquiry independent of the World Health Organization's team of independent experts sent to China last month. Officials with the W.H.O. have said in recent interviews that it was "extremely unlikely" but not impossible that the spread of the virus was linked to some lab accident. The open letter ... lists what the signers see as flaws in the joint W.H.O.-China inquiry. The letter emphasized that the team was denied access to some records and did not investigate laboratories in China. Dr. David A. Relman, a professor of medicine and microbiology at Stanford University [said] the W.H.O. investigation appears to be biased, skewed, and insufficient." Richard Ebright, a molecular biologist at Rutgers University and one of the scientists who signed the letter, said it grew out of a series of online discussions among scientists, policy experts and others who came to be known informally as the Paris group. Many of those who signed the letter were based in France and Dr. Ebright, who has been outspoken about the need to investigate a possible laboratory leak, said such discussion had been less vigorous in the United States. He said that no one in the group thought that the virus had been intentionally created as a weapon, but they were all convinced that an origin in a lab through research or by accidental infection was as likely as a spillover occurring in nature from animals to humans.