An improvised propane bomb is the most likely device used by the person behind the Christmas Day bombing in Nashville.
Nashville PD has released a high-resolution video of the explosion that can be viewed here. As a technical note, the camera may be a city camera used to monitor accidents at the intersection. The video does not offer a fast frame rate that would allow for a much closer examination of the blast.
This is video of Friday morning's explosion recorded by an MNPD camera at 2nd Ave N & Commerce St. pic.twitter.com/3vaXhoUOAR
— Metro Nashville PD (@MNPDNashville) December 28, 2020