An intelligence report conducted by private analysts and presented to the US Senate intelligence committee suggests that there may have been a "hazardous event" at the Wuhan Institute of Virology between October 6 and 11, during which time roadblocks were put in place to prevent traffic from coming to the facility, according to the report obtained by NBC News.



The 24-page report includes an analysis of phone data from around the institute, including a pattern analysis of devices that frequent the WIV, show no mobile phone activity from October 7 to 24

The analysis shows that device traffic "in and around the WIV in the months prior to October was consistent," but that "Beginning on October 11th, there was a substantial decrease in activity," suggesting that the 'window for incident' was October 6th - 11th.

"During this time, it is believed that roadblocks were put in place to prevent traffic from coming near the facility."