The US Department of Energy has concluded with "low confidence" that the Covid-19 pandemic "likely" originated from a laboratory leak in Wuhan, China, according to a classified report delivered to key lawmakers on the House and Senate Intelligence Committees. Intelligence agencies can make assessments with either low, medium or high confidence, but one source cautioned that the DOE's conclusion was not being viewed as hugely significant due to interagency disagreements. The US Department of Energy's assessment is the latest in a series of reports from the US government and other countries that have sought to determine the origin of the Covid-19 pandemic.