The motive for the bombing that rocked Nashville on Christmas Day may never be known, according to authorities.
Anthony Quinn Warner, 63, was identified by officials on Sunday as the man responsible for the explosion that injured three people and damaged dozens of downtown buildings.
But officials have thus far not provided any information on what may have driven Warner to blow up his RV outside the AT&T transmission building.
On Monday, David Rausch, director of the Tennessee Bureau of Investigation, told TODAY that because Warner died in the blast the "exact reasoning" for the bombing may never be known. Rausch said "a lot of effort" goes into determining the motive for a crime.
"So investigators from federal state and local authorities here in Nashville are working diligently, combing through the leads and the information we have coming in... we've got information coming in literally as we speak that we'll comb through," he said.
"We'll talk to a lot of people, there's a lot of interviews taking place right now and through all of that, we hope to get an answer."
But he added that "sometimes it's just not possible."
"We feel like we'll at least have a little better understanding of who this suspect was and what potential motive he had. We don't know for sure that we'll ever get there to the complete answer because, obviously, that individual is no longer with us," he said.
"The best way to find motive is to talk to the individual, we will not be able to do that in this case and so a lot of it will be what we can gather through interviews and ultimately what the evidence will point us toward.
"We may never find the exact reasoning behind the activity that took place."
The FBI is reportedly looking into whether Warner was motivated by conspiracy theories surrounding 5G technology.
And in an appearance on CBS' Face the Nation, Nashville mayor John Cooper described the bombing as an attack on infrastructure.
"To all of us locally, it feels like there has to be some connection with the AT&T facility and the site of the bombing," he said. "That's a bit of just local insight in because it's got to have something to do with the infrastructure."
Nashville police were responding to a report of shots fired early Friday morning when they came across the RV blaring a recorded warning that a bomb would detonate in 15 minutes.
Then the warning stopped and singer Petula Clark's 1964 song "Downtown" started playing before the RV exploded a short time later.
As well as damaging the AT&T transmission building and dozens of businesses, the blast also disrupted cellphone service as well as police and hospital communications across Tennessee, Kentucky, and Alabama.
