This article doesn't make this so explicit, but ATT infrastructure appears to be the intentional target of the bombing. You can see the building in the helicopter shot at the top of the NYTimes article on the story: https://www.nytimes.com/2020/12/25/us/nashville-explosion.ht... Obviously a telecommunications/switch hub, with it being a large windowless building in a downtown core. The other thing that's particularly…
AT&T says that their services went down along with the gas & power in the area, as a side effect: the gas shutoff cut off their backup generators. That doesn't sound all that targeted.
Liveleak actually has some security camera footage with audio of the recording: https://www.liveleak.com/view?t=aZhBY_1608918884