The officials declined to describe the new evidence. But the revelation that they are hoping to apply an extraordinary amount of computer power to the question of whether the virus accidentally leaked from a Chinese laboratory suggests that the government may not have exhausted its databases of Chinese communications, the movement of lab workers and the pattern of the outbreak of the disease around the city of Wuhan. In addition to marshaling scientific resources, Mr. Biden’s push is intended to prod American allies and intelligence agencies to mine existing information — like intercepts, witnesses or biological evidence — as well as hunt for new intelligence to determine whether the Chinese government covered up an accidental leak... The White House is hoping that allies and partners can tap their networks of human sources to find additional information about what happened inside the laboratory. While the United States has been rebuilding its own sources in China, it has still not fully recovered from the elimination of its network inside the country a decade ago. As a result, having allies press their informants about what went on inside the Wuhan Institute of Virology will be a key part of the intelligence push ahead.