WASHINGTON — President Biden’s name for a 90-day dash to know the origins of the coronavirus pandemic got here after intelligence officers advised the White Home they’d a raft of still-unexamined proof that required further laptop evaluation that may make clear the thriller, in response to senior administration officers.

The officers declined to explain the brand new proof. However the revelation that they’re hoping to use a rare quantity of laptop energy to the query of whether or not the virus by accident leaked from a Chinese language laboratory means that the federal government could not have exhausted its databases of Chinese language communications, the motion of lab staff and the sample of the outbreak of the illness across the metropolis of Wuhan.

Along with marshaling scientific sources, Mr. Biden’s push is meant to prod American allies and intelligence companies to mine current data — like intercepts, witnesses or organic proof — in addition to hunt for brand new intelligence to find out whether or not the Chinese language authorities coated up an unintentional leak.

Mr. Biden dedicated on Thursday to creating the outcomes of the assessment public, however added a caveat: “except there’s one thing I’m unaware of.”

His name for the research has each home and worldwide political ramifications. It prompted his critics to argue that the president had dismissed the likelihood that the lab was the origin till the Chinese language authorities this week rejected permitting additional investigation by the World Well being Group. And, administration officers stated, the White Home hopes American allies will contribute extra vigorously to a critical exploration of a principle that, till now, they thought-about at greatest unlikely, and at worst a conspiracy principle.

Up to now, the hassle to glean proof from intercepted communications inside China, a notoriously arduous goal to penetrate, has yielded little. Present and former intelligence officers say they strongly doubt anybody will discover an e-mail or a textual content message or a doc that exhibits proof of a lab accident.

One allied nation handed on data that three staff within the Wuhan virological laboratory have been hospitalized with critical flulike signs within the autumn of 2019. The details about the sickened staff is taken into account essential, however officers cautioned that it didn’t represent proof that they caught the virus on the laboratory — they might have introduced it there.

The White Home is hoping that allies and companions can faucet their networks of human sources to seek out further details about what occurred contained in the laboratory. Whereas america has been rebuilding its personal sources in China, it has nonetheless not totally recovered from the elimination of its community contained in the nation a decade in the past. Consequently, having allies press their informants about what went on contained in the Wuhan Institute of Virology will likely be a key a part of the intelligence push forward.

The inquiry has not reached a useless finish, a senior Biden administration official stated. Officers wouldn’t describe the sort of computational evaluation they need to do.

Administration and intelligence officers say it is going to be as a lot the work of scientists as spies in attempting to unravel how the pandemic was unleashed. The Biden administration has been working to enhance its scientific experience on the Nationwide Intelligence Council. Senior officers have advised the spy companies that their science-oriented divisions, which have been engaged on the problem for months, will play a outstanding position within the revitalized inquiry.

The brand new inquiry may also faucet the nationwide labs and different scientific sources of the federal authorities that beforehand haven’t been instantly concerned within the intelligence effort, the senior administration official stated.

Mr. Biden’s announcement that he would require a report from the intelligence neighborhood had parts of showmanship. By way of home politics, he’s attempting to take the initiative on a difficulty Republicans have lengthy targeted on. Senator Tom Cotton of Arkansas, who has lengthy argued the coronavirus might have emerged by accident from the Wuhan lab, stated Mr. Biden’s order was “better late than never, but far from adequate.”

And on a world entrance, Mr. Biden referred to as out Chinese language recalcitrance to cooperate on investigations each to strain Beijing to reverse course but in addition to push allies to focus their very own intelligence efforts on inspecting the idea that the coronavirus may need by accident leaked from the lab.

Like scientists and the broader public, the intelligence neighborhood stays unsure concerning the origins of the coronavirus. No definitive intelligence has emerged, and a few present and former officers expressed warning that rather more will be gathered in 90 days. Whereas the Workplace of the Director of Nationwide Intelligence will ship a report earlier than summer time’s finish, the inquiry will most certainly must be prolonged.

On Thursday, Gen. Mark A. Milley, the chairman of the Joint Chiefs of Employees, advised reporters he had not seen any conclusive proof about what was the reason for the pandemic, however supported the hassle to look deeper. “The quantity of loss of life, ache and struggling that was skilled on this pandemic is large,” he stated. “We have to know the origin, how this occurred.”

The trouble to uncover the origins of the coronavirus started greater than a yr in the past, through the Trump administration. However some officers have been cautious of President Donald J. Trump’s motives, arguing that his curiosity within the origins of the pandemic was both to deflect blame from his administration’s dealing with of it or to punish China.

Present officers say the central objective of the brand new intelligence push is to enhance preparations for future pandemics. Consequently, Mr. Biden’s message this week was calibrated to go away open the potential for future cooperation with China.

The White Home’s frustration with China has risen after its announcement this week that Beijing wouldn’t take part in further investigations by the World Well being Group. A Biden administration official stated if the brand new inquiry didn’t yield a solution, it will be as a result of China had not been clear.

However the administration isn’t attempting to isolate China, and as an alternative trying to stroll a cautious line between pressuring Beijing to cooperate and demonstrating that in its absence, america will intensify its personal investigation.

Administration officers additionally consider the brand new inquiry and Chinese language obstruction of the World Well being Group will create the chance for stepped-up intelligence cooperation with allies.

Allies have been offering data for the reason that starting of the pandemic, one official stated. However some, together with British intelligence providers, have been skeptical of the lab leak principle. Others, together with Australia, have been extra open to it.

As members of the so-called 5 Eyes partnership, Britain and Australia already broadly share intelligence with america. However the brand new intelligence assessment, together with rising frustration with China’s failure to cooperate with the World Well being Group, might prod allies to focus extra on the query of the lab leak.

A British official declined to remark. A request for remark from the Australian authorities was not instantly returned.

In his announcement on Wednesday, Mr. Biden stated two intelligence companies believed the virus most certainly occurred naturally, whereas a minimum of one different favored the idea that it leaked by accident from a lab in China. None had excessive confidence of their assessments, the president famous.

In an announcement on Thursday, Amanda J. Schoch, the spokeswoman for the Workplace of the Director of Nationwide Intelligence, stated the intelligence companies had come collectively across the two seemingly situations, however there have been to this point no high-confidence assessments of the virus’s origins.

“The U.S. intelligence neighborhood doesn’t know precisely the place, when or how the Covid-19 virus was transmitted initially,” Ms. Schoch stated.

Whereas 18 companies make up the intelligence neighborhood, solely a handful have been main gamers in assessing the seemingly origins of the virus. A lot of the broader intelligence neighborhood, together with the C.I.A. and the Protection Intelligence Company, consider there’s not but ample data to attract a conclusion, even with low confidence, concerning the origins.

The intelligence neighborhood “continues to look at all accessible proof, take into account totally different views, and aggressively gather and analyze new data to determine the virus’s origins,” Ms. Schoch stated.

Eric Schmitt contributed reporting.