In the early hours of Christmas Day, Anthony Quinn Warner parked a motorhome in front of the AT&T network center on Second Avenue in Nashville, Tennessee. Several hours later, at around 5 a.m., several loud bangs, recognized by locals as gunshots, were heard. Some 5 to 15 minutes later, there were more gunshots, prompting people to call 911. Around 5:30 a.m., a recorded message began blasting from the recreational vehicle, warning that vehicle was going to explode. A 15-minute countdown followed and then, a massive, fiery explosion. In short order, the FBI assigned 250 agents to the task of determining who had just bombed downtown Nashville. The investigation focused on Warner, 63, of nearby Antioch, who had an RV in his backyard that looked identical to the one Nashville police identified as the source of the explosion. Human tissue found at the blast scene confirmed Warner’s identity, FBI Memphis announced on Dec. …