Federal authorities on Sunday identified the suspect as Anthony Quinn Warner in a Christmas Nashville RV.
Investigators said they used DNA to identify human remains found at the scene of 63-year-old Warner. The FBI said that they also matched the vehicle identification number of the RV for registration related to Warner.
Warner is believed to have acted alone, but authorities are yet to determine a motive. He was not known to law enforcement before the Christmas explosion.
The explosion rocked Nashville early on Christmas morning, before the city’s streets were stirred by activity as well as a recorded announcement warning anyone nearby that a bomb would soon explode.
Sources say Warner was a computer consultant who worked as an independent contractor for Fridrich & Clark Realty, a Nashville-based real estate firm.
Frederick and Clark President Steve Friderick told Fox News that Warner was never an employee at the company, but occasionally serviced his computers. Frederick said that Warner announced his retirement earlier this month and that he had no further contact with the company since that time.
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“Upon learning that Tony is a suspect in the bombing of 2 Avenue on Christmas morning, Frederick and Clark informed the authorities that they had provided IT services to our firm,” the company said. “The Tony Warner we knew is a good man who never exhibited any behavior that was less than professional.”
The explosion damaged AT&T’s building and wreaked havoc on cellphone service and police and hospital communications in several southern states as the company reinstated service.
A source close to the investigation told WSMMV, Nashville’s NBC-affiliated TV station, that agents were investigating whether Warner was told about the 5G technology used to spy on Americans.
AT&T provides 5G service across the country.
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County records revealed on Sunday showed that Warner had moved two Nashville area homes in the last two years as entertainment executive to Los Angeles, but their relationship was not immediately clear. The executive, Michelle Swing, has not said publicly whether she knew Warner and denied knowledge about both houses.
The Associated Press contributed to this report.