The World Health Organization has said all theories on the origins of the Covid-19 outbreak, including the possibility of laboratory leak, are “on the table” and urged Chinese scientists to carry out their own investigations. WHO officials were answering questions from the press after a classified US intelligence report delivered to the White House on Tuesday was reported to be inconclusive on the question of the origins of the pandemic, in part due to a lack of information from China. “The current situation is that all of the hypotheses regarding to the origins of the virus are still on the table,” Michael Ryan, the head of the WHO’s health emergencies programme, in response to a question about the laboratory leak theory. “Some are more likely than others based on the current analysis, but all of those hypotheses require further elucidation and further inquiry and we will go and look where all of those leads take the WHO.” Advertisement The US intelligence assessment, which was ordered by Joe Biden 90 days ago, was unable to definitively conclude whether the virus that first emerged in central China had jumped to humans via animals or escaped a highly secure research facility in Wuhan, two US officials familiar with the matter told the Washington Post. They said parts of the report could be declassified in the coming days. Responding to reports, China’s foreign ministry spokesperson, Wang Wenbin, on Wednesday criticised Washington for “politicising” the issue of Covid origin-tracing. “The United States says it lacks information from China,” he told a press briefing, according to China News service, a state-owned newswire. “I can tell the United States that this is just an excuse to cover up the failure of its intelligence in origin tracing.” Wang said the report was political and therefore it would not draw any scientific conclusion, “and would only disturb and damage the international effort in finding the origin of the virus and the global cooperation against Covid-19”. Fu Cong, head of the foreign ministry’s arms control department, told reporters: “If [the US] want to baselessly accuse China, they better be prepared to accept a counter-attack from China. If the US thinks China is guilty, they need to come up with evidence to prove that China is guilty. You don’t blame a victim for not providing information to incriminate himself.” On Tuesday, Chen Xu, China’s permanent representative to the UN at Geneva, wrote to the WHO director general, Tedros Adhanom Ghebreyesus, alleging that the labs of Fort Detrick and University of North Carolina in the US should be the subject of investigation instead. Ryan later said the Chinese comments and the demand for an investigation of US laboratory origin of the outbreak was a “contradiction”, as Beijing had fiercely pushed back against the lab-leak theory. “I find that difficult to understand but am very willing to engage with our Chinese colleagues to understand what exactly they mean by that statement,” he said. Ryan noted that Chinese scientists had said they were conducting their own studies on Covid-19’s origins. “So we do look forward to getting updates for our Chinese colleagues on the progress with those studies,” he said. “There is no impediment right now for those studies to go ahead. Our Chinese colleagues don’t need the WHO to hold their hands through this kind of a process.” The debate over the origins of the virus that has killed more than 4 million people and paralysed economies worldwide has become increasingly contentious. When Biden assigned the investigation, he said US intelligence agencies were split over the two likely scenarios – animals or lab.