There was talk about that one, suggesting a connection with election election data being stored there. That AT&T facility was telephone switch facility and a data storage site.
AT&T had just signed a huge data collection contract for Law Enforcement.
AT&T is no longer just a telephone company. They have always been quasi governmental monopoly.
If this was not a FBI plant event, it suggests a pretty stupid attempt. Almost all large companies are covered by huge camera systems. Someone is arrested.
Perhaps Nashville is more connected beyond the AT&T Building bombing:
"The bombs had the letters “CMT” written on them and contained written threats to the comms companies, the FBI told the Associated Press earlier this week."