'Evacuate now. There is a bomb': Human remains reportedly found near explosion in Nashville that damaged 41 buildings, injured 3

The FBI was leading an investigation Friday into an explosion that erupted in downtown early Christmas morning, an incident that rattled residents for miles, caused destruction for several blocks and is being called "intentional" by authorities.

Mayor John Cooper, giving the last update for the evening, said the relief that not more people were injured has now turned to anger and determination to bring those responsible to justice.

"This was a terrible day, but Nashville has faced other challenges, particularly this year. We can rebuild and get back to normal," he said. "This morning’s attack on our community was intended to create chaos and fear in this season of peace and hope, but the spirit of our city cannot be broken."