The report — obtained by the London-based NBC News Verification Unit — says there was no cellphone activity in a high-security portion of the Wuhan Institute of Virology from Oct. 7 through Oct. 24, 2019, and that there may have been a “hazardous event” sometime between Oct. 6 and Oct. 11.

It offers no direct evidence of a shutdown, or any proof for the theory that the virus emerged accidentally from the lab.

If there was such a shutdown, which has not been confirmed, it could be seen as evidence of a possibility being examined by U.S. intelligence agencies and alluded to by Trump administration officials, including the president — that the novel coronavirus emerged accidentally from the lab.