But investigators have identified a person of interest in connection with the explosion and That rocked downtown Nashville on Christmas Day. Investigators from multiple federal and local law enforcement agencies were at a home in Antioch and suburban Nashville after receiving information relevant to the investigation, according to FBI special agent Jason Pack, another law enforcement official, speaking on the condition of anonymity, told The Associated Press. Investigators regard someone associated with the property as a person of interest in the bombing. Earlier Saturday, investigators said they were looking at a number of individuals who may be connected to the bombing but have also found no additional explosive devices. The blast, which rocked in 18 G building also knocked out some 911 cell and WiFi communications across the state.