(CNN) US intelligence and national security officials say the United States government is looking into the possibility that the novel coronavirus spread from a Chinese laboratory rather than a market, according to multiple sources familiar with the matter who caution it is premature to draw any conclusions.

The theory is one of multiple being pursued by investigators as they attempt to determine the origin of the coronavirus that has resulted in a pandemic and killed hundreds of thousands. The US does not believe the virus was associated with bioweapons research and the sources indicated there is currently no indication the virus was man-made. Officials noted that the intelligence community is also exploring a range of other theories regarding the origination of the virus , as would typically be the case for high-profile incidents, according to an intelligence source.

The theory has been pushed by supporters of the President, including some congressional Republicans, who are eager to deflect criticisms of Trump's handling of the pandemic.

An intelligence official familiar with the government analysis said a theory US intelligence officials are investigating is that the virus originated in a laboratory in Wuhan, China, and was accidentally released to the public. Other sources told CNN that US intelligence hasn't been able to corroborate the theory but is trying to discern whether someone was infected in the lab through an accident or poor handling of materials and may have then infected others.

US intelligence is reviewing sensitive intelligence collection aimed at the Chinese government, according to the intelligence source, as they pursue the theory. But some intelligence officials say it is possible the actual cause may never be known.